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Like Walt says... twist the pump with a big pipe wrench, but twist carefully applying a little upward pressure. I'd also advise removing the flywheel and the back gear cover plate and the idler gear (check other threads for how to do this...). that way you can keep an eye on the visible smaller end of the pump. You want to make sure to douse the smaller end with plenty of the acetone/tranny fluid (let that soak for a couple days with the engine right side up) and when you're twisting on the big end, make sure the small end is moving as well. It's pretty easy to bust the casing by twisting too hard, the large part of the pump will turn 360 degrees and seem to be freed up, but the smaller part will stay put... don't ask me how I know this.. mine came out in pieces!