The front face of the TH400 is compatible with the Chevy 90 degree “Small Block” or the “Big Block” patterned engines. As an upgrade of this nature can result in a more enhanced Jeep powertrain over 727, 999. It is entirely possible to make the Chevy 400 compatible in the AMC I6 & V8 engines. 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.
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