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Both trucks are 4.3 V6. Both are 4x4. My 1998 GMC 1500 has a bad tranny and my uncle has a wrecked 2000 Blazer with a rebuilt tranny in it. Does anyone know for certain if the blazer tranny will go in the GMC without a problem? I know the transfer cases are probably different so I'm not worried about that.
I don't know the answer to your question off the top of my head, but if you can get your hands on a Hollander manual, the answer should be in there. Most good junkyards have Hollanders.