GM Full Size Vans 1967-1986 Repair Guide

Identification

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The transmissions can be quickly identified visually. The word Powerglide is embossed on the right side of the Powerglide case. The Turbo Hydra-Matic 350 has an almost square shaped pan with the right rear corner cut off diagonally; the 400 has an irregularly shaped pan. The Turbo Hydra-Matic 350 has a cable operated downshift linkage connected the the carburetor throttle linkage, while the 400 has an electrical downshift switch on the accelerator linkage.

 
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