Noisy rear diff.
Thread Starter
|
Senior User
Joined: Jul 2002
Posts: 299
Likes: 0
From: Ripley NY
Noisy rear diff.
Our 2003 Mountaineer has had a whiny rear diff since we got it a year ago. I'm curious if maybe a diff from a newer model, with less miles on it would fit as a replacemnet. I'm not sure if it would be cheaper just to have it rebuilt or replace it with a newer used one. It drives me nuts when I drive the car. Has anyone ever tried quiting them using different oil possibly? Any help would be appreciated.
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
THE noise comes on about 60 MPH and quits about 70 MPH ?
When you back off on the throttle, the noise goes away ?
Your problem is gear whine.
--Some have installed new gears and had success. I thought if you could chage the oil viscosity or "stickness" it might chanage the noise. I have installed 75 w 140 full synthetic oil with a 7 oz bottle or two of friction modifier in mine. It made over 50% of the noise go away. We have had the 2002 EXP since 2004 and it hassss always had the noise. Changing the viscosity and adding friction moidifer might help to change the noise or the MPH at which it occurs. --- no rear pan on the EXP. you drain thru a 1 inch drain plug, and refill thru the normal 1/2 inch size plug.
When you back off on the throttle, the noise goes away ?
Your problem is gear whine.
--Some have installed new gears and had success. I thought if you could chage the oil viscosity or "stickness" it might chanage the noise. I have installed 75 w 140 full synthetic oil with a 7 oz bottle or two of friction modifier in mine. It made over 50% of the noise go away. We have had the 2002 EXP since 2004 and it hassss always had the noise. Changing the viscosity and adding friction moidifer might help to change the noise or the MPH at which it occurs. --- no rear pan on the EXP. you drain thru a 1 inch drain plug, and refill thru the normal 1/2 inch size plug.
Thread Starter
|
Senior User
Joined: Jul 2002
Posts: 299
Likes: 0
From: Ripley NY
Yep that is exactly what it is. I thought about getting some redline heavy shock proof oil in it. I used that in a few other vehicles I had and it stopped it for a while.The mountaineer doesn't have a pan either, just the plugs. I don't personally love the vehicle enough to spend the money for a regear,but my wife may say get it fixed LOL.
Thanks for your response.
Thanks for your response.
Thread
Thread Starter
Forum
Replies
Last Post
bearster18
1987 - 1996 F150 & Larger F-Series Trucks
4
Jul 18, 2012 03:47 PM
Dsl Lover
1999 - 2016 Super Duty
19
Nov 30, 2006 12:30 PM
