ill say this the T56 is a nice trans but in stock form its not going to handle the weight. Im on my 3rd trans, First being a Liberty T56 that was proshifted gernaded it behind a NA 408, then bought a viper T56 and hurt that behind a turbo 4.8, now i have a viper spec'd T56 built by me and its holding up better.
ill say one thing that needs replaced is the master, stock truck masters dont have enough bore size to properly disengage a Fbody clutch. I bought a Tick performance corvette master that uses a 7/8 bore an seems to be disengaging the clutch much better. not to mention the stock clutch line is junk, i upgraded to a -4 line with AN fittings instead of the pure design stock line that has teh 1/16 restrictor, my pedal is very firm now using these two upgraded items. Youll have more into a trans, bell housing, master cylinder/ lines then you would an 80e. then you have a clutch which will cost near 1k. the 80e swap is cheaper at first
i wouldnt even think of using a t56 behind a 4wd truck for performance, the weight of these trucks being 2wd is to much.
using this trans makes for one hell of a highway bruiser or corner carver if your setup for that
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