What year model vehicles transmissions are
compatable with 89 GMC Sierra 4x4
And which year model vehicles transfer cases
are compatibla with 2001 chevy sileverado 4x4
All the 4l60e transmission should fit your truck. I don't know about the transfer case, however the case and transmission from and 90s should fit right in. the original transmission in your truck should not have been a 700r4, by 89 it should have been a 4l60 or 4l60e. So is your truck a 5.7?
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