Rear LSD questions

[2.5GT]

Did search all around, didn't exactly find what I was looking for. So I might as well ask here.

I want to upgrade my rear open differential on my '98 4EAT BD with the final drive of 4.444. So far, the only vehicles that has LSD rear diff. ratio are the '00-01 Impreza RS 4EAT, '02-05 Forester 4EAT.

My question is, will either of these diffs. bolt right in?
And will I need to swap axles with the rear diffs.?

I've read that the regular R160 will match up with the same diff. axles. Only the JDM ones, you need to swap axles to fit. Is this correct? If so, then it should fit right?

[rougeben83]

You need to match up the FD. That's pretty much it.

[2.5GT]

Ok, I got the answer I'm looking for.

On hallowpoint's wagon, the previous owner drop in a diff. from an '04 Forester and didn't need to swap over axles. So that's very good news. I should be getting one from a junkyard next week. I'll see how that goes :grin:

Link for future reference on the ratios.

http://wac.addr.com/auto/obs/lsd/lsd.html


Model Year Model Trim Transmission Front Ratio Center Ratio Rear Ratio Rear LSD
1991-1992 Legacy Turbo AWD 5MT 3.900 1.000 3.900 Y
1992-1997 SVX AWD 4EAT 3.545 N/A 3.545 Y
1993-2001 Impreza 1.8L, 2.2L AWD 4EAT 4.111 N/A 4.111 N
1993-2001 Impreza 1.8L, 2.2L AWD 5MT 3.900 1.000 3.900 N
1998-1999 Impreza 2.5RS 4EAT 4.444 N/A 4.444 N
1998-1999 Impreza 2.5RS 5MT 4.111 1.000 4.111 N
2000-2001 Impreza 2.5RS 4EAT 4.444 N/A 4.444 Y
2000-2001 Impreza 2.5RS 5MT 4.111 1.000 4.111 Y
2002-2003 Impreza 2.5RS 4EAT 4.444 N/A 4.444 N
2002-2003 Impreza 2.5RS 5MT 4.111 1.000 4.111 N
2002-2003 Impreza TS, Outback Sport 4EAT 4.111 N/A 4.111 N
2002-2003 Impreza TS, Outback Sport 5MT 3.900 1.000 3.900 N
2002-2003 WRX 4EAT 4.111 N/A 4.111 Y
2002-2003 WRX 5MT 3.900 1.100 3.545 Y

Other North American Subaru models with LSD, either as standard equipment or available as an option:

* 2000-2002 Forester S (All Weather Package)
* 2003 Forester XS
* 2000 Legacy GT, Outback
* 2001-2003 Legacy (all)
* 2003 Baja



More ratios for the AT.


FORESTER 00 - 02 Rear, AT (4.444 ratio), locking
FORESTER 03 - 03 Rear, AT (4.444 ratio), locking (XS model)
FORESTER 04 - 04 Rear, MT, locking, XT model (4.444 ratio, turbo)
FORESTER 04 - 04 Rear, AT (4.444 ratio), locking, XS model
FORESTER 04 - 04 Rear, AT (4.444 ratio), locking, XT model (turbo)
FORESTER 05 - 05 Rear, MT, locking, XT model (4.444 ratio, turbo)
FORESTER 05 - 05 Rear, AT (4.444 ratio), locking, XS & LL Bean models
FORESTER 05 - 05 Rear, AT (4.444 ratio), locking, XT model (turbo)
FORESTER 06 - 07 Rear, MT, locking, XT model (4.444 ratio, turbo)
FORESTER 06 - 07 Rear, AT, locking, XS & LL Bean models (4.444 ratio)
FORESTER 08 - 08 Rear, MT, locking, XT model (4.444 ratio, turbo)
FORESTER 08 - 08 Rear, AT, locking, XS & LL Bean models (4.444 ratio)
IMPREZA 00 - 01 Rear, 2.5L, AT (4.444 ratio)
LEGACY 05 - 06 Rear, Outback, 2.5L (4 cyl), turbo, MT (4.444 ratio)
LEGACY 07 - 07 Rear, Outback, 2.5L (4 cyl), turbo, MT (4.444 ratio)
LEGACY 08 - 08 Rear, Outback, 2.5L (4 cyl), turbo, MT (4.444 ratio)

[hallowpoint]

On hallowpoint's wagon, the previous owner drop in a diff. from an '04 Forester and didn't need to swap over axles. So that's very good news. I should be getting one from a junkyard next week. I'll see how that goes

i was just about to post this, thanks