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    Installing a 6 Speed Allison behind a 12v Cummins

    Hey guys, new here. I've been reading up on clutches for high HP builds and from what I've gathered, Alto G3s take the most abuse. Seems like most guys run a mix of GPZ for C1s and C2s and G3s for C2s, C3s, and C4s. I swapped a 12v Cummins into my H1 and after driving with a built 4l80 for a...