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Check out the tech link section (that's a link) and there are some tables to cover different trannies and t-cases. AFAIK, in the 40/45 series trucks there is the J30 3-speed tranny, the H41 4-speed (with a low first gear), the H-42 4-speed (regular first gear), H55F 5-speed, the 3-speed t-case...