what is the difference exactly between a manual and automatic transmission's rear differential (model 20) on a '77 CJ-7? I have heard there is a difference in the spacing, how much is there, and can I absorb it with a different drive shaft if I were to swap axles?
If the automatic has a Quadra-Trac behind it, the answer is no. The pumpkin is offset to the passenger side with the QT and yours is centered. The angle created with the centered output of the T-case and offset input of the diff is too great for the u-joints to absorb. Check it out though, someone may have put the automatic in there with a transfer case with a centered output.
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