I was thinking today, I have a 4psd d/r range tranny in my car, I looked at the rear diff and it has a 3.7 ratio sticker on it. Is it supposed to be 3.7 or 3.9, for that tranny?
Before, I had the Auto tranny in it, and in 4wd at 45mph i would get a humming from the rear. It doesn't do it now...with the 4psd in there...maybe that's why the automatic died?
Thanks.
[HTi]Johnson
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Guest Message by DevFuse
Rear diff
Started by
[HTi]Johnson
, Dec 15 2004 02:19 AM
8 replies to this topic
#1
[HTi]Johnson
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Head Trauma, inc.
- Coburg, Or.
Posted 15 December 2004 - 02:19 AM
#2
GLCraig
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Livin' the live
- LV, Washington
Posted 15 December 2004 - 02:31 AM
The correct rear diff for a d/r 4speed is a 3.9 and the correct rear diff for a EA81 4wd Auto is a 3.7; you may have a misslabled rear diff if you're not binding with the current setup.
#3
[HTi]Johnson
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Head Trauma, inc.
- Coburg, Or.
Posted 15 December 2004 - 10:27 AM
What do you mean by not binding?
#4
Sweet82
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Elite Master of the Subaru
- Salt Lake City
Posted 15 December 2004 - 10:46 AM
In 4wd your rear wheels are trying to pass the fronts if you have a D/R and a 3.7 diff 
You'd probably hear your drivetrain trying to compensate for the difference in speed. Churping rear wheels?
You may be able to jack the car up and see if the front and rear wheel move the same speed in 4wd.
You'd probably hear your drivetrain trying to compensate for the difference in speed. Churping rear wheels?
You may be able to jack the car up and see if the front and rear wheel move the same speed in 4wd.
#5
grossgary
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Elite Master of the Subaru
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Posted 15 December 2004 - 01:23 PM
binding....in 4wd going around a turn on concrete...does it feel like itsbraking when your wheels are turned all the way?
#6
Numbchux
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EJ conversion addict
- Duluth, MN
Posted 15 December 2004 - 05:43 PM
binding....in 4wd going around a turn on concrete...does it feel like itsbraking when your wheels are turned all the way?
that's it, but if you've got the wrong diff in there, it'll do that when you're going straight
#7
garner
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Brat Master Flash
- Vilas, NC
Posted 15 December 2004 - 06:08 PM
I was thinking today, I have a 4psd d/r range tranny in my car, I looked at the rear diff and it has a 3.7 ratio sticker on it. Is it supposed to be 3.7 or 3.9, for that tranny?
Before, I had the Auto tranny in it, and in 4wd at 45mph i would get a humming from the rear. It doesn't do it now...with the 4psd in there...maybe that's why the automatic died?
Thanks.
[HTi]Johnson
That tranny is definately 3.9 and that's the diff you need. I'm surprised something hasn't busted yet....
garner
#8
[HTi]Johnson
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Head Trauma, inc.
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Posted 16 December 2004 - 12:00 AM
well, guess what I need to buy.
#9
garner
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Brat Master Flash
- Vilas, NC
Posted 16 December 2004 - 01:10 AM
hti,
pm me. I have a spare 3.90 diff.
garner
pm me. I have a spare 3.90 diff.
garner
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