( Available For Sale Until Marked Down as SOLD ) is a THM-400 2WD transmission. I was told it worked before being pulled but couldn't hurt to have it refreshed, all complete. A TH400 transmission will fit Buick, Oldsmobile, Pontiac, Cadillac (BOPC) engines, but you must have the correct "BOP" bolt pattern case, not the Chevrolet-specific pattern. The TH400 was used across these GM divisions from 1964/1965 on making them compatible with those engines. Key Fitment Details: BOP Pattern: The BOPC case pattern fits all Buick, Oldsmobile, Pontiac, and Cadillac V8 engines. Chevy Pattern: A Chevrolet-pattern TH400 will not bolt directly to a Pontiac/Cadillac engine without an adapter plate. Exceptions: Some rare, late-model "unicase" TH400 transmissions feature both Chevy and BOP bolt patterns, allowing them to fit any GM engine. Identification: The BOP case typically has a more pointed top, whereas the Chevrolet case is rounded. (That Is All The History And Information On This Transmission No Further History Or Information Will Be Givin Or Available Nor am I UPS or FEDEX) Conserned About Fitment Google It.