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1960–1972 Chrysler A903 — 3-speed manual for 6-cyl and low power V8s. 1st gear, no synchromesh [1]; 1961–1971 Chrysler A745 — 3-speed manual for V8s
The TH400 was phased out for the 1980 models, when the A-727 replaced the TH-400 as the only automatic transmission option for both the SJ Wagoneer/Cherokee wagons and the J-10/J-20 trucks. Internally similar to the Chrysler A-727, the case was one-piece, cast with an AMC pattern bellhousing (not interchangeable with a Chrysler pattern A-727).
Note there are unique bellhousing bolt patterns for the small block "A" and big block "B" engine versions of this transmission and for American Motors (AMC) and Jeep applications. 1962-1978 361, 383, 400 B-Motor V8; 1962-1978 413, 426 Wedge, 440 RB-V8; 1966-1971 426 "Street" Hemi; 1964-1971 426 Race Hemi (super stock, etc.) 1962-1966 318 "A ...
The Iron Duke I4 used by AMC in Jeeps from 1980 to 1983 used the standard small block Chevrolet bolt pattern bell housing. The later (1984-02) AMC I4 had the GM 60 degree V6/I4 bolt pattern, and this was retained for the life of the engine. AMC often used lighter duty transmissions with the four cylinder engines.
Manual transmissions were modified by removing synchronizers which lowered the chances of missed shifts. A Hurst floor-mounted shifter came standard. The automatic transmissions were the then-new Chrysler-built 727 TorqueFlite three-speed with 8-3/4 inch large stem pinion center section with a 4.86 gear set, and a 2,600 rpm high speed torque ...
The LA engine is a family of overhead-valve small-block 90° V-configured gasoline engines built by Chrysler Corporation between 1964 and 2003. Primarily V8s, the line includes a single V6 and V10, both derivations of its Magnum series introduced in 1992.