Outback auto diff in manual Spec B Legacy?

[sandspider]

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

[Greenmamba]

I believe it'll make a significant difference. In effect, wouldn't the front and back wheels be trying to rotate at differing speeds?

[sandspider]

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>

[sandspider]

I think you're right, it would bugger the centre diff. Shame.

Thanks.

[Rps]

I bet @Tidgy will no

[savage bulldogs]

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

[Tidgy]

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.

[sandspider]

Thanks all. That's not going to work then! Shame.