I would check to see if your 5.125 has the 4 mm ring gear spacer. If it does, then you remove it before installing the 3.7 or 3.9 ring and pinion.
Ross
sports imports
Rear Diff Swap Questions
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sports imports
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Steve49841
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Re: Rear Diff Swap Questions
We aren't doing a ring and pinion, we are swaping the entire center section, 5:13 out...3:90 in.
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SLOroadster
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Re: Rear Diff Swap Questions
It should be a plug and play.
Will
Will
Sorry, I find modern engine swaps revolting. Keep your G, R, or U series in your Roadster!