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
Welcome to Ultimate Subaru Message Board, my lurker friend!
 |
Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created. We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning ** Not an actual guarantee, but seriously, you probably won't regret it! Serving the Subaru Community since May 18th, 1998! |
Guest Message by DevFuse
Rear diff
Started by
[HTi]Johnson
, Dec 15 2004 02:19 AM
8 replies to this topic
#1
[HTi]Johnson
-
- Members
- 1,522 posts
Head Trauma, inc.
- Coburg, Or.
Posted 15 December 2004 - 02:19 AM
#2
GLCraig
-
- Members
- 2,706 posts
Frak
- Canby @#$% Oregon
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
-
- Members
- 1,522 posts
Head Trauma, inc.
- Coburg, Or.
Posted 15 December 2004 - 10:27 AM
What do you mean by not binding?
#4
Sweet82
-
- Members
- 3,271 posts
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
idosubaru
-
- Members
- 23,088 posts
Elite Master of the Subaru
- East Coast
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
-
- Members
- 6,701 posts
EJ conversion addict
- Saginaw, 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
-
- Members
- 689 posts
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
-
- Members
- 1,522 posts
Head Trauma, inc.
- Coburg, Or.
Posted 16 December 2004 - 12:00 AM
well, guess what I need to buy.
#9
garner
-
- Members
- 689 posts
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
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users
