Ls1 Powerglide
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The GEN III/IV engine has moved one of the bolt holes to the 12-o'clock position. Any GM tranny will bolt up, but I am not sure if it is NHRA legal. I believe an adapter plate is required if you are wanting to bolt a standard GM tranny to an GEN III/IV. There are shops out there that make TH400, TH350, and PG with the GEN III/IV bolt pattern.