The Ugly Duck Jeep gets a new 700r4 Manual Valve Body transmission and 3,000 stall billet torque converter.

The 700R4 transmission is an automatic transmission that was found in GMC and Chevrolet cars and trucks. It was developed with the aim of improving fuel economy in cars, and it achieved this goal thanks to the overdrive it featured.

Build of the 700R4
The 700R4 transmission is made from cast aluminium, which adds to its sturdiness and ruggedness. It’s 23.4 inches long, weighs 155 pounds, and has 16 bolts. The tail shaft housing is connected to the main case by four bolts, and the bolt spacing is comparable to that of the THM350 transmission. Dimensions of the 700R4 are:

625 in. tail shaft housing.
Transmission’s width where it bolts to the engine is 20 in (51 cm).
5 in. from the engine/trans mating surface to the cross member mount bolt.
375 in. from the engine/trans surface to the output shaft housing mating surface.
External dimensions are the same as that of a THM350 with a 9inch tail housing as found in the GMC long wheelbase truck/vans.
This transmission can store about 11 quarts of transmission fluid and its recommended fluid is DEXRON VI. That aside, there was a Kcase 700R4 transmission, and this was the 700R4 with the label K on its case. The transmission case was stronger and thicker since it was designed for heavier 4×4 trucks used for offroading.



700R4 Performance Specs
The 700R4 transmission first gear, second gear, third gear, fourth gear, and reverse gear are 3.06, 1.63, 1, 0.7, and 2.9 respectively.

Its lower first gear ratio provides excellent performance for low vehicle speeds. Besides, a 30% overdrive brings about enhanced fuel economy, a reason that can also be attributed to the popularity of the 700R4.

The torque that can be handled by a 700R4 transmission varies depending on its production year. Nonetheless, you can expect a max engine torque around 350 lbft and a max gearbox torque of 650 lbft.



GM’s 700R4 Transmission
The 700R4, also known as Turbo HydraMatic, is a 4speed automatic transmission that was launched by General Motors in the early 1980s. It is an upgrade to the 3speed TH350 automatic transmission and older models of rearwheeldrive cars.

Also, the 700R4 transmission featured a 30% overdrive in 4th gear which brought about fuel economy. This overdrive allowed sports cars and pickup trucks that came with it to be more affordable to drive.

Over the years, the transmission has had a change of name, and there have been significant upgrades to its build. We’ve outlined an overview of the 700R4 transmission, its upgrades, problems, and what made it one of the best transmissions in its time.


Valve bodies are 100% quality checked for proper function, and where applicable, proper operating pressures are checked on a dedicated valve body test machine.

Fits 19811993 700R4 transmissions. Full manual, reverse shift pattern with ability to lock the torque converter clutch in 2nd, 3rd and 4th gears. No engine compression braking.

Kit comes complete with valve body, 6061T6 aluminum separator plate, Corvette servo assembly and pressure regulator spring.