Originally Posted by Antichrist
You don't need the whole diff, the RR R&P will fit the Series carrier. I put a set in an 88 I converted to a Perkins 4.203 in '82.
Are you sure about this? Im pretty sure a RR R&P will not fit the series carrier. you will have to use the carrier from the RR as well and put the R&P and carrier in the Diff.
You can put the 4.7 series gears on the 3.54 carriers with a spacer ring but pretty sure it wont work the other way.