sandspider Posted April 4, 2017 Share Posted April 4, 2017 Hi all Just wondering - does anyone know if the rear diff from a 2008 3.0 automatic Outback would also fit a 2004 3.0 manual Legacy? According to Opposed Forces, my diff has a 3.545:1 final ratio. According to an eBay seller, their automatic Outback diff has a 3.3:1 ratio. If the seller is correct, which I'm not totally sure of, is the 0.2 difference in final ratio likely to make a noticeable difference? Cheers. Giles Quote Link to comment Share on other sites More sharing options...
Greenmamba Posted April 4, 2017 Share Posted April 4, 2017 I believe it'll make a significant difference. In effect, wouldn't the front and back wheels be trying to rotate at differing speeds? 2 Quote Link to comment Share on other sites More sharing options...
sandspider Posted April 4, 2017 Author Share Posted April 4, 2017 Hmm. Good question! I don't know what the ratio of the front diff is, and I was only thinking in terms of effect on the rear wheels of replacing the rear diff with one of a slightly different ratio... <goes off to scratch head> Quote Link to comment Share on other sites More sharing options...
sandspider Posted April 5, 2017 Author Share Posted April 5, 2017 I think you're right, it would bugger the centre diff. Shame. Thanks. Quote Link to comment Share on other sites More sharing options...
Rps Posted April 5, 2017 Share Posted April 5, 2017 I bet @Tidgy will no Quote Link to comment Share on other sites More sharing options...
savage bulldogs Posted April 5, 2017 Share Posted April 5, 2017 Yeah it would wind up the centre diff , I think tidgy experienced that when his 6 speed box didn't have the same ratio as his 5 speed diff . I think it started jumping on the dyno but I don't know how far out his ratios were Quote Link to comment Share on other sites More sharing options...
Tidgy Posted April 6, 2017 Share Posted April 6, 2017 aye diff was miss matching so rear wheels were going at different speed to fronts, quick diff swap and jobs a fish. As far as the ratio being out it needs to be matched perfectly or you'll get issues that will destroy your diff. Quote Link to comment Share on other sites More sharing options...
sandspider Posted April 6, 2017 Author Share Posted April 6, 2017 Thanks all. That's not going to work then! Shame. Quote Link to comment Share on other sites More sharing options...
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