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The 366 BBC I used in my truck works good, steel crank is stock, but originally I found in was still low on power when i was hauling, Of course I do not have low range any more, Sure would be nice. I think I should have installed a higher stall torque converter with the Allison, that is still...

Thanks Tplane, not sure I follow the axle explanation. I never new about the under drive thing, thanks for that. My transferr case is a single speed 1:1 ratio where the original tranny did the reduction. I replaced it with a normal tranny, auto 4spd. The transfer case is divorced from the tranny...

Hi, I am a new member, not sure if your still looking at the mods for your truck. Anyway I have a 1955 M135, I got a 1991 GMC school bus with a 366BBC and an Allison 4spd automatic tranny. I transfered the engine, tranny, all the front end/dash wiring, power steering, power brake master...