Th400 overdrive

Essentially a TH400 with overdrive and more rugged internals, the GM 4L85E is the ultimate automatic. When built right, they can handle over 1,000 hp reliably, and best of all, transplanting one into a fourth-gen is much easier than Internet mythology suggests. "People are very intimidated by the 4L85E.

Th400 overdrive. The TH400 has a gear ratio of 3.55:1. This ratio gives the transmission better efficiency. It’s also better for faster speed. A higher overdrive gear ratio, such as that of Powerglide, helps with acceleration. A faster acceleration comes along with consistent speed as well.

These overdrive packages add up to a much improved driving experience. The engine is less stressed on the highway, which means you’re less stressed, and the ride is quieter with lower engine speed and less fuel consumption. Swap that Powerglide, C4, TH400, 700R4 or TH350 with one of our Packages.

I don't have the tail piece for the TH400 and dont want to deal with making that functional again without the overdrive. Also, we would be interested in trading for a BBC supercharger, preferably a procharger. Thanks Paul 1969 RS Camaro 1985 Buick GN 2005 F-250. 02-17-2011 #7.Find ATI TH400 Transmissions and get Free Shipping on Orders Over $109 at Summit Racing! ATI Performance Products TH400 transmissions offer great performance for 400 c.i.d. or larger big blocks. Modifications and options include: * Fully blueprinted and equipped with high-flow lube circuits, increased torque capacity, and …Gear Vendors Overdrive - looking for a wiring diagram. This is not Tri-Five specific but I figured I would start here since there are some really smart folks here. I'm doing a rewire on my friends car with a TH400 and a GV overdrive. There is nothing wrong with it but this car has a lot of accessories that were added on over time.But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. The reason for this is the conspicuous lack of an overdrive gear ...Tighten the eight nuts and take the driveshaft with the new yoke (included) to the local driveshaft shop to be shortened (as per the instructions). Plug in the electronics and fill the overdrive with the recommended lube, and you are ready to drive. All trucks, rv’s, and vans have clearance for the overdrive but some cars and street rods can ...Aug 2, 2004 · I just had a Level 2 - 200r4 from Bow Tie overdives installed. The big difference between the 700 and 200 is the first gear ratio. The 700 is 3.06 and the 200 is something like 2.7. This means a lot less of a torque drop unless your engine is built for it. I'm still evaluating the difference from the TH400 to the 200. 1965-UP GM CHEVY TH400 TH375 GEAR VENDOR OVERDRIVE BRAKE TYPE HOUSING WITH SEAL. Parts Only. $575.00. transmart4x4transmissions (1,140) 98.3%. Buy It Now. Free shipping. 15 watchers.

1965-UP GM CHEVY TH400 TH375 GEAR VENDOR OVERDRIVE BRAKE TYPE HOUSING WITH SEAL. Parts Only. $575.00. transmart4x4transmissions (1,140) 98.3%. Buy It Now. Free shipping. 15 watchers. The 200-4R Conversion Kit includes most everything you will need when attempting a conversion, minus the driveshaft work. This Conversion Kit is often used when converting from a TH350, TH400, or Powerglide transmission to the 200-4R transmission. Monster Sale Price: 199.95. Buy in monthly payments with Affirm on orders over $50.The Turbo 400 transmission, also known as the TH400, has a transmission fluid capacity of 6 quarts. This amount equates to 12 pints of fluid total. The TH400 is an automatic transm... The Truck was rented for the 2004 Quatar Rally and won that event also. Chevrolet Pro Truck – 850hp with a Th400 and Gear Vendors Under/Overdriveâ„¢ used in all the championships. [email protected]. GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020. Toll Free 800-999-9555 • Telephone (619) 562-0060 • Fax (619) 562-1186. Gear Vendors Activation in 1970 El Camino with turbo 400 transmission - YouTube. Scott Cerreta. 135 subscribers. Subscribed. 130. 19K views 2 years ago. This …Today, HTC has revealed their latest consumer-focused headset, the $499 Vive Flow. It’s designed for portability with a compact design and 189 gram weight, though there are some bi...

Description. Automatic 3-Speed TH 400 4″ Tailhousing. Replaces 4″ tailhousing. Small block and Big block cars. Additional information. Product ID. 11184. Weight. 0.06 kg.4. Coupler for hooking the TH400 tailshaft to the AUX. O/D Input shaft. 5. Couple slid on, and note the factory lip on the TH400. 6. Tranny end of the Adapter plates, note lip to accept the lip on the TH400. 7. This is the end view of the TH400 with the Adapter bolted inplace.This ratio is ideal for getting the best speed. If you want to get your car moving fast, get the TH400. And according to Gear Star, 4L80E transmissions have nearly 25% overdrive and are 4 inches longer than the TH400. On the other hand, a higher overdrive gear ratio facilitates faster acceleration. The 4L80E has such a ratio, which is …While the TH400 lacks the overdrive gear of the 4L80E, every other gear is the same. Here are both transmissions gear ratios. These transmissions combined have …***FOR TH400, soon C4 & 4L80E overdrive trans @ $6500.00 complete with one ratio of choice or $11,500.00 with 5 different ratios. Attachments. underdrive CLIP_FNL.jpg. 58.4 KB · Views: 3,981 underdrive on trans.jpg. 272.1 KB · Views: 1,958 Reply. Robert Mason Well-Known Member. Joined Oct 1, 2003 Posts 754 RDC Crypto 654

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The Ranger shifter and twin-stick shifters for the Atlas 3.0:1 T-case are also seen where we chose to place them. Ranger Torque Splitter Pros & Cons. Pros. Super tough and durable. Shifts just ...Plug the vacuum hole in the carburetor or the port in the EFI with a cap. Install the TV cable. (Black unit directly below the throttle cable). Note: Powerglide, TH350 and TH400 transmissions use a vacuum controller to up-shift the gears. Push the end of the TV cable through the hole in the mounting bracket.This Monster Powertrain Package is complete with all the features you need for a reliable Chevy 383 & Automatic Overdrive TH400 Transmission from a researched and developed combination of components. INCLUDED FREE - No Fault Warranty A 1-time no questions asked repair or replacement. Covers Shipping, Freight claims, Installation errors ...Shifter Conversion Kits, Automatic Transmission, Converts Stock Powerglide Floor Shifter To Work with TH350 or TH400, Chevrolet, Kit. Part Number: SIW-SC2031-C. ( 1 ) Estimated Ship Date: Today. Free Shipping. $191.99. Add To Cart. Compare. Wish List.

Our Stage 2 TH400 includes all the components in the Stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manual/automatic valve body or forward pattern full manual upon request. Aluminum Deep pan and additional modifications. 750 HP/TQ capable.GEAR VENDORS provides an overdrive product to race cars and trucks up to 2,000 hp. This product is particularly well suited to the special demands of Drag We...Essentially a TH400 with overdrive and more rugged internals, the GM 4L85E is the ultimate automatic. When built right, they can handle over 1,000 hp reliably, and best of all, transplanting one ...But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. The reason for this is …GM 3-Speed Automatic Truck/Motorhome. With the GEAR VENDORS dashswitch in “auto” you will have automatic overdrive just like the vehicle came with a factory system. The GEAR VENDORS will shift on and off without attention of the driver and can be used while towing up to combined weights of 30,000 lbs. An interactive floorswitch is …Clearly, the biggest difference between the TH400 vs 4L80E is the 4L80E’s overdrive gear. Although they come from different eras, there is quite a bit that these two transmissions have in common. The mere fact that people are so interested in this topic is a testament to the absolute bulletproof reputation of the TH400. There aren’t too ... TH400 Planetary. This is designed to maintain cruising speeds of the vehicle while simultaneously reducing the RPM produced in order to better fuel economy and prevent excess noise and wear made by the various parts of the transmission. Monster uses this in conjunction with the TH400 planetary gearset to allow the gears to turn at their peak ... th400 route is tons stronger, with a little less od. and should cost a little more, its the way i would go. The 4L80E is just as strong as the TH400. The GV and TH400 Is a great combo, giving you a 6 speed automatic. Hard to argue with, but... The 4L80E is just as durable and has a lower first gear for take off and the serious gas saving ...As it depends on the make, model, and year of the transmission. However, a general rule of thumb is that the torque converter ratio (TCR) for a TH350 transmission should be around 3.0. The TH400 transmission turbo is a 4-speed automatic transmission. It has a Ratios of: 1st Gear: 3.42 2nd Gear: 2.92 3rd Gear: 2.48 4th Gear: 1.Mar 27, 2011 · 8509 posts · Joined 2009. #1 · Mar 27, 2011 (Edited) I've been doing some research and I'm thinking seriously about installing one of Gear Vendors Overdrive units on the back end of my Turbo 400 that's in my 55 Sedan. Currently, the rpm is over 4,000 when cruizing at 65 - 70 mph, I'd like to get it down in the 2,200 - 2,500 rpm range at 70 ... GEAR VENDOR OVERDRIVE INTERNAL PLANETARY SET WITH ELECTRIC VSS LATE TH400 & 4L80. Pre-Owned. $1,500.00. transmart4x4usainc (1,295) 100%. Buy It Now. Free shipping. 1965-UP GM CHEVY TH400 TH375 GEAR VENDOR OVERDRIVE BRAKE TYPE HOUSING WITH SEAL. Parts Only. $350.00.

That's why I'm interested in the GV TH400 overdrive. Solves the high RPM on the highway problem and improves racing performance over just running the TH400 alone. All that and the TH400's renowned durability is retained. A 700R4 feels like a step in the wrong direction, especially when I already have a good TH400 in place.

Shifter Conversion Kits, Automatic Transmission, Converts Stock Powerglide Floor Shifter To Work with TH350 or TH400, Chevrolet, Kit. Part Number: SIW-SC2031-C. ( 1 ) Estimated Ship Date: Today. Free Shipping. $191.99. Add To Cart. Compare. Wish List.Sep 12, 2008 · 1023 posts · Joined 2006. #1 · Sep 12, 2008. A good friend of mine just picked up a 66 nova with turbo 400 that is equipped with an aftermarket Doug Nash overdrive unit. It is the weirdest set up I have seen. It bolts to the back of the th400 and has a switch in the car to shift to overdrive. He is thinking about taking it out. In today’s digital age, libraries have evolved to offer more than just physical books. The New York Public Library (NYPL) is one such example, with its innovative digital platform ...Gear Vendors review. As of 9/21/2012 I completed the install of the under/overdrive gear vendors unit. Once I received the box and looking at the unit it's pretty sweet looking piece and I was excited to get it installed. Now just so everybody knows I'm not a mechanic just a weekend warrior that's learning as I go.Re: Gearventor overdrive Munro - try going to their website and clicking on 'Contact Us.' You can submit info directly via the site. The email address is the one you have in your post. I have had GV with my TH400 for 10 years and love it. Don't expect a lot of overdrive (.78) but more of a keeping the engine in the power band as they advertise.I've been asked several times about seperating the overdrive. At this moment I don't want to seperate it. I don't have the tail piece for the TH400 and dont want to deal with making that functional again without the overdrive. Also, we would be interested in trading for a BBC supercharger, preferably a procharger. Thanks PaulThe TH400 ( Figure 1) has four endplay tolerances (NOT to be confused with clutch clearances) that should be examined and corrected during repair. However, GM’s published rebuild procedure only references two of them! With two endplay tolerances being ignored, you can imagine why these meltdowns are occurring. Figure 1.The 700R4 Conversion Kit includes most everything you will need when attempting a conversion, minus the driveshaft work. This Conversion Kit is often used when converting from a TH350, TH400, or Powerglide transmission to the 700R4 transmission. Monster Sale Price: $549.99. Buy in monthly payments with Affirm on orders over $50.The 700R4 Conversion Kit includes most everything you will need when attempting a conversion, minus the driveshaft work. This Conversion Kit is often used when converting from a TH350, TH400, or Powerglide transmission to the 700R4 transmission. Monster Sale Price: $549.99. Buy in monthly payments with Affirm on orders over $50.

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***FOR TH400, soon C4 & 4L80E overdrive trans @ $6500.00 complete with one ratio of choice or $11,500.00 with 5 different ratios. Attachments. underdrive CLIP_FNL.jpg.GM 4-Speed Auto - Gearvendors. GM 4-Speed Automatics 700R4/4L60E/4L80E There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications. 700R4/4L60E’s have a low 3.06 first gear which is good for initial take off but this...Turbo 400 4x4 on sale with Free Shipping, Now offering TH400 4WD, TH-400, Monster 400 Transmission, heavy duty Th400 and heavy duty Turbo 400 with new lower prices 0 800-708-0087A 4L80E will use a little more power in overdrive because the speed of the mass overdriven is higher with the overdrive unit located in front of the compund gearset as compared to behind it with the gear vendors .However this is not a huge difference and it is only in overdrive,not when drag racing.The 4l80e can be built just as tough as the 400 …This is a great thread--- thanks to ALL you guys!!! Was considering 4L80E swap sometime ago but instead went with the Gear Vendors install to my 1008, finally, and it's a wee-bit disappointing that with the TH400/GVunit, you really only gain about 8-10 mph speed increase in overdrive.Nick Johnson from Gear Vendors talks about how an overdrive unit can help a car equipped with a TH400 transmission. “This overdrive unit can handle upwards of 4,000 horsepower and is easy to install. The crossmember and tunnel will require no real modifications in most cases to install the unit.Description: TH-2004R 4 speed AT/Overdrive Transmission Kit- Rated for 700 HP (bolts directly to Pontiac blocks with no adapter plate) ... Description: TCI TH400 B.O.P. Super Street Fighter Auto Shift Transmission 4" Tail Shaft-Without Trans Brake Item #: TCI-211305. Condition: New. $299 handling fee will be charged in the cart and covers all ...How much do you know about high-speed trains? Keep reading to discover 8 Benefits of High-speed Trains. Advertisement One of the key pieces of infrastructure that we could really u...The numbers: Solid, at first glance. The German banking giant’s first-quarter profit fell by 34%, but beat analyst expectations. Its share price jumped by more than 3% on the news.... ….

Watch the tips and tricks as we install a Gear Vendors Over Drive in Brads 1971 Camaro.It is a US Gear Dual Range Auxiliary Overdrive unit that bolts in between a Chevy TH400 transmission and your transfercase (6 bolt round). This works, in terms of adding OD to a transmission, like a Gear Vendors unit except this is intended to allow you to be in four wheel drive as it bolts between the transmission and the t-case.Nick Johnson from Gear Vendors talks about how an overdrive unit can help a car equipped with a TH400 transmission. “This overdrive unit can handle upwards of 4,000 horsepower and is easy to install. The crossmember and tunnel will require no real modifications in most cases to install the unit.Gearvendors was a dealer and bought out Laycock when they went belly up. Gearvendors did some minor internal changes including increasing hydraulic pressure to te o/d ring from 500 psi to 900psi. They are generally a . 68 to .70 reduction overdrive. They work best with rear ratio in the high 3s to mid 4s.The Insider Trading Activity of DRIVE CAPITAL OVERDRIVE FUND I, L.P. on Markets Insider. Indices Commodities Currencies StocksThe TH400 ( Figure 1) has four endplay tolerances (NOT to be confused with clutch clearances) that should be examined and corrected during repair. However, GM’s published rebuild procedure only references two of them! With two endplay tolerances being ignored, you can imagine why these meltdowns are occurring. Figure 1.There is a difference in size between the Th400 and Th350. Generally, the Th400 is larger and longer than the 350. While the Th400 is about 24-3/8 inches long, the th350 is about 21-3/4 inches long. Even comparing the th350 vs. th400 weight, the turbo 400 is heavier. Read More: 545RFE Transmission—All You Need to Know.It was time to look up Gearstar. I found Gearstar online (www.gearstar.net) and clicked the "TH400" link. There were three levels of TH400 builds: Level 2 ($1,395) will hold up to 450 hp; Level 3 ($2,195) up to 550 hp; and the Level 4 ($4,395) package will handle up to 850 hp. They come with bottles of ATF, fluid coolers, heavy-duty aluminum ...Our Stage 2 TH400 includes all the components in the Stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manual/automatic valve body or forward pattern full manual upon request. Aluminum Deep pan and additional modifications. 750 HP/TQ capable.Find Parts and Accessories th400 overdrive KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! $20 Off $250 / $40 Off $500 / $80 Off $1,000 - Use Promo Code: CARCARE Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Th400 overdrive, TimAT. 523 posts · Joined 2007. #2 · May 6, 2010. Back in the late 60's early 70's there was a company that made an OD unit-- Hone Overdrive. Long since gone, but I've heard of one made by Gear Vendors. Problem with a C-3 is the driveshaft is so short there just is not much room lengthwise, and the tunnel is pretty small aft of the trans., Not only will an Overdrive Transmission improve your performance, but it will reduce your fuel consumption by up to 33%. We have everything you need to make the conversion from the older TH350, TH400, and Powerglide to the newer Overdrives., R23-586145. Rocket. $190.00 each. We Bolted In A California Performance Transmission 200-4R Overdrive In Place Of A Beastly Turbo 400 And The Result Was A Complete Transformation., Clearly, the biggest difference between the TH400 vs 4L80E is the 4L80E’s overdrive gear. Although they come from different eras, there is quite a bit that these two transmissions have in common. The mere fact that people are so interested in this topic is a testament to the absolute bulletproof reputation of the TH400. There aren’t too ..., Muscle Cars / Hot Rods GEAR VENDORS can give your GM / Dodge / Ford vehicle up to twice the forward gear ratios, unparalleled performance and the ultimate in horsepower handling of any auxiliary transmission. There is no competing underdrive or overdrive transmission available on the market that will give you the performance of a … Continue …, With gasoline prices reaching all-time highs, some of you may have considered converting your two-speed Powerglide or even your Turbo Hydra-Matic 350 or 400 to a more miserly overdrive transmission. Many enthusiasts recommend installing a TH700R-4, however another alternative for an overdrive on the cheap is the TH200-4R., A negotiable instrument is a signed document that gives the bearer of the document permission to obtain a certain amount of money. A negotiable instrument is a signed document that..., 2-Speed Max Duty Outlaw T400 Transmission. Race Clutches and Steels. Increased clutch capacity in all positions - up to 9 forward, 8 direct and 6 intermediates. Blueprinted high-flow front pump with heat-treated tube or ATI Super Pump. Billet aluminum safety reverse transbrake valve body (band apply option available), February 26, 2014, 09:44 AM. Since there is a distinct lack of information out there on the Doug Nash Enterprises Dual Range, or DNE2, I'm going to try to put everything I have gleaned on them in one place. And document reviving this one that I got from SuperBuickGuy "recently" . These 2 terminals connect to the reversible 12v motor by …, Tighten the eight nuts and take the driveshaft with the new yoke (included) to the local driveshaft shop to be shortened (as per the instructions). Plug in the electronics and fill the overdrive with the recommended lube, and you are ready to drive. All trucks, rv’s, and vans have clearance for the overdrive but some cars and street rods can ... , Around the same time when the TH400’s name was changed, an overdrive version called the 4L80-E was launched. This is an electronically controlled transmission that is still being produced and used in a range of heavy-duty GM and military cars/trucks., This ratio is ideal for getting the best speed. If you want to get your car moving fast, get the TH400. And according to Gear Star, 4L80E transmissions have nearly 25% overdrive and are 4 inches longer than the TH400. On the other hand, a higher overdrive gear ratio facilitates faster acceleration. The 4L80E has such a ratio, which is …, Crosley. 10749 posts · Joined 2002. #3 · Sep 4, 2008. the over drive of a 700r4 trans is not separate design that can be added to another transmission. The 4L80e has a few parts that exchange with a t-400 , vastly different transmissions. F-350 DRW Diesel w/5th wheel RV. Voedsephobia is the fear of garbage disposals. Like., Gear Vendors Activation in 1970 El Camino with turbo 400 transmission - YouTube. Scott Cerreta. 135 subscribers. Subscribed. 130. 19K views 2 years ago. This …, Gvman without purchase of Overdrive: $69: ShiftBall: Logos Scatbee, Rat Fink w/od purchase: $79: ShiftBall: Original OE Logo Ford GM Dodge etc: $79: Chrome: Option chrome/polish new overdrive: $650: This pricing available at over 700 dealers or www.gearvendors.com Call 800-999-9555 for appointment and installation information. …, This is also why all GM Callaway Twin Turbo Corvettes with …, TH400 (CX) with Coan 8" converter, GV-OD, 8 track still on console and best et 10.495, 128.79mph 1.428 60' All with 1960's stuff. (except tires and converter) ... its preset with certain MPH that it will turn the overdrive unit on, and also its made to protect the overdrive unit to be on while in reverse or under 20MPH thats (which will damage ..., , Drivetrain Tech. Gear Vendor O/D install with TH-400. My 72 after sitting a few days is hard to start. Took off the fuel line and it was dry. My thought was the fuel pump was letting the fuel pump bleed off. Took off the fuel pump and the bottom was twisted or rather torqued out of shape. Someone put a lot of torque on the metal fuel line ..., The Truck was rented for the 2004 Quatar Rally and won that event also. Chevrolet Pro Truck – 850hp with a Th400 and Gear Vendors Under/Overdriveâ„¢ used in all the championships. [email protected]. GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020. Toll Free 800-999-9555 • Telephone (619) 562-0060 • Fax (619) 562-1186. , Find many great new & used options and get the best deals for US Gear Doug Nash Overdrive Dne2 Adapts to Turbo 400 & 4l80e 72-80011 71-80031 at the best online prices at eBay! Free shipping for many products!, Jul 28, 2014 · But the TH350 and TH400 three-speed versions (and their two-speed Powerglide cousin) fall short when it comes to highway cruising. The reason for this is the conspicuous lack of an overdrive gear ... , The 700R4 Conversion Kit includes most everything you will need when attempting a conversion, minus the driveshaft work. This Conversion Kit is often used when converting from a TH350, TH400, or Powerglide transmission to the 700R4 transmission. Monster Sale Price: $549.99. Buy in monthly payments with Affirm on orders over $50., Marriott's Pine Cliff Resort is ideal for families that want to discover Portugal's Algarve reason. Read on to find out why. Update: Some offers mentioned below are no longer avail..., We cover the install of the Gear Vendors Overdrive on the 1969 Camaro. This modification helps us split our gearing, which will improve our 1/4 mile time dra..., Ingenious mechanism gives you a .78 overdrive that you can retrofit to just about any transmission on the market. Able to withstand several thousand horsepo..., 343 posts · Joined 2009. #1 · Apr 10, 2014. Can anyone tell me about Doug Nash overdrives for TH400. I have found one thats reasonably priced and am looking at buying it for my 88 3500 dualie tow vehicle. It's 496 BBC. I want to drop highway RPM & hopefully improve the fuel economy. My trailer is about 4 ton, loaded., This Monster Powertrain Package is complete with all the features you need for a reliable Chevy 383 & Automatic Overdrive TH400 Transmission from a researched and developed combination of components. INCLUDED FREE - No Fault Warranty A 1-time no questions asked repair or replacement. Covers Shipping, Freight claims, Installation errors ..., GM 4-Speed Auto - Gearvendors. GM 4-Speed Automatics 700R4/4L60E/4L80E There are two basic GM 4-Speed automatics: The light duty 700R4/4L60E found mainly in half ton and car applications, and the heavy duty 4L80E in the heavier applications. 700R4/4L60E’s have a low 3.06 first gear which is good for initial take off but this..., Just Put A 700r4,its A Th350 With Overdrive,i Would Just Build A Th400;build It Right,it Will Last For Years . ... Another company that makes an auxiliary overdrive unit is US Gear, with their V2OD for hot rods and pro-touring cars. ATI, one of their distributors, sells it for $1800. Like the Gear Vendors unit it attaches in place of the ..., This is a superior alternative for most cars thinking of going to a Th400. The GEAR VENDORS.78 to 1 ratio allows you to go to a numerically higher rear gear to improve your 60ft. times and get it all back with the overdrive. The reciprocal of our ratio is 1.28 so a car that currently runs a 4.56 rear could go to a 5.84 without loss of top end ..., Cons: it’s really heavy (110 pounds MORE than a TH400) and has the highest HP loss of all transmissions, can easily be built for 1,000 HP. 5-6 grand built “right”. -Gear Vendors overdrive. Cons: Gotta beat the floor up a bit, I think it’s 60 to 80 pounds, bad drive line angles. Around $2,700.00., Description. 1985-On, 700R4 Humvee Special. Swap a TH400, 3 Speed to a 700R4, 4 Speed Overdrive Transmission. Convert your TH400 transmission to a 700R4 overdrive transmission. You get the level 2, 700 Raptor Junior transmission, #2 special low stall diesel torque converter, special low RPM diesel governor, special adapter and special output ...