tailgatewagon Posted August 2, 2006 Share Posted August 2, 2006 anyone done it? i have a 3.9 vlsd from a 91 leg(yep with stub shafts) and a 4.11 in my obs. im going to atempt the swap just like the 3.7-3.9 swap... anyone ever gone 3.9-4.11?????? thanks for any info.... Link to comment Share on other sites More sharing options...
offroadsubaruguy Posted August 2, 2006 Share Posted August 2, 2006 it should be the same as the 3.7 to 3.9 swap, just with different gears. just dont forget to change your front diff as well..... meaning you will have to swap trannies.... Link to comment Share on other sites More sharing options...
ShawnW Posted August 3, 2006 Share Posted August 3, 2006 Let us know how it goes i am thinking of doing it. Link to comment Share on other sites More sharing options...
GLCraig Posted August 3, 2006 Share Posted August 3, 2006 Wouldn't an OBS have the newer style rear axles where the inner DOJ has a stub shaft that's machined out of the same chunk of material? There may or may not be an issue with getting those to insert correctly into a VLSD. If there is an issue, you could probably use the stub shafts that came with the VLSD and use some rear axles from an earlier Impreza. Link to comment Share on other sites More sharing options...
Kostamojen Posted August 3, 2006 Share Posted August 3, 2006 Just use the ring/pinion from your old diff on the new diff and you wont have to change anything else. I've got a 3.9 VLSD WRX diff on my 4.11 RS tranny in my L via that method. Link to comment Share on other sites More sharing options...
Free Range Posted August 3, 2006 Share Posted August 3, 2006 should work fine, just keep the side case shims matched to their associated ring and pinion, I mixed them up on my 4.11 clutch type LSD swap and the diff slowly ate itself up in 10K miles. Link to comment Share on other sites More sharing options...
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