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oh so im looking at 2 trucks today. both 4.9L manuals, one is a 5speed one is a 4speed. both 8gen. i would rather have the 5speed but the one with the 4speed is a fair amount cheaper. both are 2wd. how hard is it to swap a m5od or zf in to repace the 4speed? would it be super easy or difficult. i would imagine you could just drop the old one off the bell housing and put in the new one in its place right? please help me! thanks guys!