Rear end whines while decelerating after changing diff fluid

Bd361

Bd361

New Member
Joined
Feb 4, 2022
Messages
4
Location
North Carolina
I just changed the oil in the rear differential (Valvoline 80w90) in my 02 TJ. Now the rear end whines when decelerating. Any ideas?
I'm pretty handy but certainly not a true mechanic. Constantly seeking knowledge!
 
Bd361 said:
I just changed the oil in the rear differential (Valvoline 80w90) in my 02 TJ. Now the rear end whines when decelerating. Any ideas?
I'm pretty handy but certainly not a true mechanic. Constantly seeking knowledge!
Click to expand...
Typically that is an indicator of a pinion noise - It would be good to get a qualified shop to check it. I don’t know why you’re hearing it unless your old fluid had gotten so thick that it was keeping it quiet - It may increase your odds of getting it corrected by not driving it too much right now- But you may have wear-

You should have about 2 quarts of fluid in the differential
 
The Sounds Of Death/ Randys world wide.

A “whirring” sound generated by unloading via deceleration from most any regular road speed can likely be traced to pinion bearing failure or poor pinion bearing preload. This malady is often diagnosed as a bad ring and pinion gear.
Just to brighten your day. IA#2
 
Check your pinion nut. When I had my first TJ regeared I had the same noise going on. Shop showed me the pinion nut was loose and the pinion had about 1/8” of play. They said they saw it all the time on Dana 35 axles.
 
  • Like
Reactions: AndyG
Gilaguy23 said:
The Sounds Of Death/ Randys world wide.

A “whirring” sound generated by unloading via deceleration from most any regular road speed can likely be traced to pinion bearing failure or poor pinion bearing preload. This malady is often diagnosed as a bad ring and pinion gear.
Just to brighten your day. IA#2
Click to expand...
Gee thanks!! And a cold rainy day to go with it!!!
 
Jamison C said:
Check your pinion nut. When I had my first TJ regeared I had the same noise going on. Shop showed me the pinion nut was loose and the pinion had about 1/8” of play. They said they saw it all the time on Dana 35 axles.
Click to expand...
Some things are hard to check when you're laying on your back! Guess I need to make friends with someone that has a lift!!! Thanks
 
Bd361 said:
Some things are hard to check when you're laying on your back! Guess I need to make friends with someone that has a lift!!! Thanks
Click to expand...
It is worth it to make the effort rather than lose your gears - Since it’s just started there might be hope that you can quieten it back down...But if you keep driving it you’re going to go down a bad road possibly.
 
Bd361 said:
Some things are hard to check when you're laying on your back! Guess I need to make friends with someone that has a lift!!! Thanks
Click to expand...
Not necessarily. It’s as simple as pulling on the shaft. I found the video they sent me.
 
  • Wow
Reactions: lBasket
Bd361 said:
I just changed the oil in the rear differential (Valvoline 80w90) in my 02 TJ. Now the rear end whines when decelerating. Any ideas?
I'm pretty handy but certainly not a true mechanic. Constantly seeking knowledge!
Click to expand...
Just making sure it was a GL-5. If it is a GL-5 what you added was fine, maybe bearings or a gear were starting to go bad prior to the gear lube change.
 
  • Like
Reactions: Jamison C
Is it a limited slip? Isn’t there an additive that’s has to be added to help the friction plates in there which if not added causes problems?
 
Top Bottom
Back