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I am installing 383 stoker in my 81 and am afraid to blow my 4 speed. Any aftermarket 4 speeds available that will bolt in and take the torque?
I can get you a Richmond Super T-10 road race 4-speed that will handle it new from my supplier.I'd probably buy your old one too.
Pm me if you are interested in going this route.
I want to say this tho'......I have ran Stock Super T-10s behind hot SB,and healthy BBs,and they are good trans.Easily equal to the muncies that came out behind BBs.I'd be more worried about your rearend when/if you hook up.