When I did mine I saw reference to people using one or two drywall screws to pull the old seal out. If I remember right for my 77 T/A the service manual said to start the engine and turn to the left lock to blow out the seal. Obviously you have to catch the fluid too to avoid a mess but I opted for that route and it popped out just fine. I don’t recall any other difficulties, tips or tricks. I ended up resealing the rest of the box but that was several years ago and still leak free.
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1977 Trans Am 400/4speed (swap)
Brian
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