![]() ![]() The earliest Turbo 400s in Jeeps featured a factory adapter plate, whereas older AMC versions came with a dedicated AMC style case. The engine compatibility and adaptability of the TH400 transmission include: 1. Nonetheless, the 1976-1979 AMC case is similar to that of the TH400’s, from the collar of the case and back, however, it is tilted about four degrees. Whether it’s the 2wd and 4wd versions of the Turbo 400, either of these can be used. The TH400 can easily be adapted for use in most Jeeps longer than CJ5s, and as such, it is an excellent conversion transmission. Despite the difference, the TH400 is considered the heavy-duty version of the Turbo-Hydramatic 350. On the other hand, the TH350 uses a mechanical cable kick-down that is connected to the throttle linkage. The TH400 transmission takes advantage of an electrical slide switch controlled by the throttle linkage. TH400Ī simple way to differentiate them is to check the kick-down mechanism. One can easily different either these variants apart by looking out for the “375-THM” designation cast on the bottom of the tail housing. ![]() In contrast, the TH475 was used in larger trucks from 1971 since it is an extra-heavy-duty version. The TH375 was used in smaller displacement cars between 1972-1976. There are two variants of the TH400, and these are the TH375 and TH475. In line with that, the fluid pan has an irregular shape. There is a hex bolt pattern on the rear mounting face of the transmission and the ribs run forward longitudinally. This TH400 is the largest of the common GM automatic transmissions, however, the transmission still maintains a compact design. The case is very smooth and its length sits at length of 24-3/8″ long. The TH400 transmission comes with a case made of cast aluminum alloy to give it strength and durability. The Turbo 400 transmission can be identified in the following ways: 1. First gear: 2.48:1, Reverse gear: 2.08:1, and third gear is an even 1 to 1.Bell housing integrated into the transmission.It was also durable, and these characteristics can be tied to the following: The features of the TH400 Transmission enabled it to provide improved performance over previous transmissions. Generally, here’s a list of cars that used the TH400 transmission: This is an electronically controlled transmission that is still being produced and used in a range of heavy-duty GM and military cars/trucks. Around the same time when the TH400’s name was changed, an overdrive version called the 4L80-E was launched. The change in naming does not come as surprise since some GM transmissions were also renamed (for example the 700R4 to 4L60). GVW or Gross Vehicle Weight) in 1990 to make it easier for buyers to identify the transmission. The naming of the TH400 was changed to 3L80 (3-speeds, Longitudinally positioned, 8000 lbs. In the 1970s, the TH400 was used in heavier-duty GM trucks and it was available in 2wd and 4wd configurations. This stator helped to vary the torque converter’s characteristics, and you can tell a car has this stator by the two-prong plug on the case. Buick, Olds, and Cadillacs that were later launched between 1965-1967 also featured the transmission but with an innovative variable-pitch stator. Upon its launch, the TH400 was evident in Buicks and Cadillacs, and a year later, it was used in Chevrolet and Oldsmobile cars. It was used in a wide range of vehicles, hence, it was not just exclusive to GM cars. The TH400 was launched by General Motors in 1964, as a replacement to the ST300 2-speed automatic transmission. of input torque, nonetheless, aftermarket designs that have been modified may go beyond that rating. This placement is aimed at providing the best power ratio and durability for rear-wheel drive. ![]() The GM TH400 transmission is a three-speed automatic transmission that was longitudinally positioned behind the engine. The TH400’s high-level of adoption could be tied to its remarkable features, and it proved that people can once again rely on GM transmissions.īut what were these features sported by this durable and legendary transmission, and generally, what set it apart from other transmissions from this manufacturer? An overview of the TH400 transmission will give you a better idea. This popular transmission was found in GM’s cars, as well as, Rolls-Royces, Jeeps, Jaguars, Ferraris, etc. The TH400 or Turbo 400 is a good transmission that was used in several cars years ago. ![]()
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