[DLM3X]

Just picked up a 2007 X (4 wheel drive) and on my ride home I notice a very loud whining noise coming from the rear when I let off the throttle. Starts above 40mph. Truck also clunks when shifting from drive to reverse. Differential?

 

[Mtndewfiend]

Ring and pinion with rear end bearings . Or swap complete rear end

 

[DLM3X]

Oh man. That doesn’t sound cheap.

 

[Mtndewfiend]

Would start by checking fluid and see what condition it is in .

 

[DLM3X]

My local guy who I trust said the rear diff is shot. He said because you will never know what you are going to find when you open it up that it would be best to find a used rear end from a local junk yard since they are pretty cheap.

What would you guys do?

 

[mikidymac]

Why just guess and throw money away blindly?
Take 15 minutes and pull the rear cover and see if you see anything obvious. Turn the wheels off the ground and see if the axle bearings make any noise.
It really frustrates me that nobody wants to do any simple diagnostics anymore, all they want to do is install new parts and hope it fixes the issue.

 

[Brunnie]

My local guy who I trust said the rear diff is shot. He said because you will never know what you are going to find when you open it up that it would be best to find a used diff from a local junk yard since they are pretty cheap.

What would you guys do? What about replacing it with an electronic locking rear diff?

Take 15 minutes and pull the rear cover and see if you see anything obvious. Turn the wheels off the ground and see if the axle bearings make any noise.

If you trust your mechanic... tell him to get off his butt and pop the diff cover and see what is really going on. He will either be right or he will be wrong. If he is right, then he is worthy of your trust. If he is wrong.... time to find a trustworthy mechanic.

 

[campisi]

The whine sounds like the pinion bearing. I had a 69 Olds 442 that sounded exactly like that ... I drove it for over 20K miles with that whine-only-when-you-let-off-the-gas noise before I finally had the bearing replaced. Other than that the rear end was fine. No clunk from D to R though. Good luck.

 

[DLM3X]

So I took it to another shop this morning. (Mechanic with really good reviews) he wants $1,300 to install a used (80k miles) rear end. I asked him to crack the pumpkin open and he wanted 2hrs labor to do that because he said it could be a lot more than what’s inside the diff. This is fun.

 

[mikidymac]

You have nothing to loose checking in yourself other than $20 for some oil and a tube of silicone.

 

[JeffPro4x]

That noise definitely sounds like the pinion bearing. Just went through this.

The real issue is how long has it been going and did it f up the r&p too

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[DLM3X]

Can the pinion bearing be accessed from the differential cover or does everything need to come out. Nobody here in boston wants to remove the cover and take a look without me paying them 1hr labor.

 

[JeffPro4x]

Can the pinion bearing be accessed from the differential cover or does everything need to come out. Nobody here in boston wants to remove the cover and take a look without me paying them 1hr labor.

They should be able to diagnose a bad pinion bearing on a lift without pulling the cover. Changing it on the other hand...


As far as charging you to look at it... Of course they would. There's labor and consumables involved.

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