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Newbie with tranny questions

trans1973

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trans1973 Enthusiast

trans1973

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First off hey everyone and thanks in advance for answering any of my not so smart questions. I have a 89 gmc sierra 2500 4wd. Would this be a 3L80 tranny, there is no overdrive? Is the 3L80 the same as a turbo 400? My motor is knocking badly. I have an older carbed motor sitting in the garge with low miles. Will this tranny function behind the older motor with a carb and hei dizzy or does it need the computer to shift? If I choose to go this route, is there anything else I should consider for the older motor swap? Thanks again for any help I recieve.

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