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Old 06-26-2008, 10:36 PM   #1
Scooby Newbie
Member#: 183290
Join Date: Jun 2008
Location: North AL
Default 3.90 to 4.11 Rear Diff ??

95 Impreza AWD (1.8/5MT -3.90) Transfer is 1:1

Swapped in 95 EJ20G and TY752VB4AA (4.11)Trans

Dedicated RX car.

Need to do obtain the matching 4.11 rear diff, what options do I have?

1)Just replace Ring Gear/Pinion with 4.11 set?
Part #'s ?

2)Acquire used 4.11 rear diff?
Which model/YR donor vehicle would work?
Is there an axle difference? (I would assume so)
vLSD available?

3)Acquire a custom/rebuilt unit?
Are these available?

4) Something I haven't thought of?

Looking for some quick help, need this item in rather short order.

Disclaimer: Yes...I have searched. Can't seem to find any definitive answers.

Thanks in advance for the assistance.
tbone256 is offline   Reply With Quote
Old 06-26-2008, 11:37 PM   #2
Scooby Guru
Member#: 5218
Join Date: Mar 2001
Chapter/Region: MWSOC
Location: SAUL'S Motorsports
96L Most Over-
Developed Beater


You couldn't have searched too much. I've answerd this question 3-4 times this year alone.....

Find a 4.11 rear diff from any 2.5RS or non-turbo LGT and put it in your car. Get axles too if yours have spring pins holding them onto your diff (like the fronts). If they don't have pins, you should be able to use them. VLSD's came on some "LS" model Legacies and all 00-01 RS's.

For an aftermarket LSD, do another search as the info is very much available.

Jay Storm
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Old 06-27-2008, 01:18 AM   #3
Scooby Newbie
Member#: 183290
Join Date: Jun 2008
Location: North AL

Thank You Mr Storm.

Now if any one else wants to offer a 50 yr old, non-computer savvy, enthusiast some additional info.....I'll graciously accept it.
tbone256 is offline   Reply With Quote
Old 06-27-2008, 04:51 AM   #4
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


If you have a 3.9 rear end, one option is to swap out the spider gear and pinion shaft of the 4.11 tranny with the 3.9 spider gear and pinion shaft.....

I am doing this in the next few weeks and doing a video of it. Takes about two hours WITH problems.
reddevil is offline   Reply With Quote
Old 06-27-2008, 12:10 PM   #5
Scooby Newbie
Member#: 183290
Join Date: Jun 2008
Location: North AL

I really want to retain the 4.11 setup......thanks for your input.
tbone256 is offline   Reply With Quote
Old 06-27-2008, 12:30 PM   #6
Scooby Specialist
Member#: 19562
Join Date: Jun 2002
Chapter/Region: NESIC
Location: VT
95 coupe


I have 4.11's in my 95 coupe with a vlsd. It is well worth the effort especially if you go to larger wheels and tires. Swapping the entire diff is by far the easiest/ cheapest option.
John*G is offline   Reply With Quote
Old 06-27-2008, 12:59 PM   #7
Scooby Specialist
Member#: 139045
Join Date: Jan 2007
Chapter/Region: South East
Location: Clearwater, FL
05 STI SnowmanTune


Just buy a Rear end with a 4.11 in it! much easier and less time consuming. Go on the for sale drivtrain thread. Alot of ppl selling the diff!

And ill buy your 3.9!!!
ryan_west06 is offline   Reply With Quote

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