Dumb question about differential
Thread Starter
Racer
Joined: Mar 2006
Posts: 358
Likes: 96
From: Hattiesburg MS
Dumb question about differential
I am swapping out the 2.73 differential for a 3.42. I just drained the gear oil out of the old diff. and realized I don’t know were to add to oil back when I get the new one in. 
How do you add oil when the drivetrain is completely installed?
How do you add oil when the drivetrain is completely installed?
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
Originally Posted by jgorss
I am swapping out the 2.73 differential for a 3.42. I just drained the gear oil out of the old diff. and realized I don’t know were to add to oil back when I get the new one in. How do you add oil when the drivetrain is completely installed?
How do you add oil when the drivetrain is completely installed?I am assuming that you have an automatic transmission, so don't forget that you will have to have your shift points reset.
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
You will need to have the PCM programmed to for the 3.42 rato as well or you will get a P1870 (transmission component slipping) code, which will cause the PCM to max the line pressure causing jarring shifts and prevent torque converter lockup.
You can avoid the code by not using the D/OD gear position unless you are going over 60 mph until you get it programmed out
You can avoid the code by not using the D/OD gear position unless you are going over 60 mph until you get it programmed out
Le Mans Master
Joined: Dec 2000
Posts: 9,909
Likes: 1,858
From: Hot Springs AR
Originally Posted by Bill Dearborn
If you are asking "where" Vs "how" it is through the same hole that you drain the fluid. Using a baster will work fine.
Bill
Bill
For the diff?? My M6 3.42 diff drains right out the bottom drain plug. Are the A4 diffs different?
Have a good one,
Mike
Drifting
Joined: May 2002
Posts: 1,607
Likes: 1
From: San Francisco CA
The fill plug should be visable from the rear of the diff, to the right of the cover just below midline. The fill plug also has the gear ratio ID tag with it. The drain plug is on the bottom
Last edited by SFVetteman; May 16, 2006 at 04:12 PM.
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