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4.11 into 3.90


Uberoo
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Ive heard that legacy diffs are 4.11,but they also have inner stubs instead of the outer stubs.Is it possible to put the 4.11 ring and pinion gearset into a 3.9 diff housing and then just slide in the outer stubs?

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it's not the housing that's different. it's the carrier.

 

first gen legacies have male stubs just like EAs. All other EJs have female splines in the diff.

 

 

I'm running a 4.111 rear diff from a '99 RS with the carrier from an EA turbo sedan in my XT6 right now. completely bolt-in.

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The male/female stub thing will swap around. I needed a 4.111 diff for a transmission swap into a '96 legacy and the one I got was a male (90 to 94 5MT diff). Rather than change the axles I dissasembled both diffs and swapped the spider gears - that is I took the 3.9's female style spiders and installed them into the 4.111 diff in place of it's bolt-in male style spider's. Worked just fine. Didn't have to touch any R&P stuff or reshim anything. When you are talking about open diffs only, all the parts seem to match up pretty well over the years.

 

GD

Edited by GeneralDisorder
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