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You don't mention what year your truck is, or what transmission the donor cab or your truck are?All the cabs are the same with the exception of the center hump.All 4x4s have tall center humps. 2 wheel drive SM465 transmission cabs have a tall center hump that doesn't go back under the seat as far. 2 wheel drive 3 spds. and automatics have a low hump. If the new cab is not the same as yours its as simple as cutting out your center hump, and mounting it in the new cab. I like to use a sealant butyl tape, and large head self drilling sheet metal screws. Others weld them in.Using a body lift will make it clear as well. but I don't recommend body lifts.As far as the body bushings you need to use the ones for your year frame. 73 to 80, or 81, 87/91.
Well if you look at my name you can see that mine is a 77 and for transmission I have a th350. The 78 cab is a 4x4 truck and it has a th400 trans. So looks like it should work, just have a tall center hump cause there is no way I can cut mine out and swap it cause mine is completely gone. Thanks.