Inside the Original Jeep Quadra-Trac
The only transmission used with the Quadra-Trac was the General Motors TH400 three-speed automatic with a bellhousing pattern unique to the AMC engines. The tailshaft is the only other nonstandard GM part—it’s a 10-spline shaft that sticks out a good foot from the rear of the housing. This shaft drives the sun gear in the reduction housing, or the drive coupler in the units without low range. The coarse nature of the 10-spline shaft wears on itself and the sun gear, causing a loud bang when it’s shifted into Reverse. View Related Article
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