Question about Chevrolet Blazer

1 Answer

Rear End Whine Under Load

My 2000 Blazer has developed a whine in the rear when you push on the gas; i.e. when the drive train is under load. The whine tends to diminish or go away when you let off the gas and coast. I had a differential fluid leak which I fixed, and then refilled the differential with new gear oil; but the whine is still there. I am suspicious that the pinion gear bearing might have gotten worn when the fluid level was low. Or, that the pinion and ring gears might be worn - although there were no filings or obvious wear spots on the gears when I opened it up to check it out and replaced the gasket to fix the leak. Is there a way to differentiate the source of the whine; i.e. pinion bearings or gears. And is the bearing replacement a difficult project? From what I've read I don't think that I want to mess around with the gear replacement. Thanks a lot.

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Chevrolet Master
  • 453 Answers

Replacing gears and/or bearings in a differental is not an easy project. You'll need a press. The positioning of the gears requires a great deal of precision. Shims are used to acheve the correct setting. Preload setting on the pinion bearings is critical. I would recommend leaving this one to the experts.

Posted on Jul 13, 2013


3 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 76164 Answers

SOURCE: rear diff leaking. how do i fill?

there is a fill plug on the side of the carrier housing on the nose of it, but if the rear end is noisy it is to late, u have damaged the gears or the bearings or both.

Posted on Mar 24, 2009

  • 1102 Answers

SOURCE: Have a rear end whine

Any time you do work on the ring and pinion set, there are precise specificatons and adjustments that have to be made. You did set the gear lash, and "preload" on the pinion bearing? If not then I would take it to a repair facility that you trust and is familiar with setting the specs. If the rear end ring/pinion gears are not set-up right, you can have a bigger problem that just whine.

Posted on May 13, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a 99 blazer 4x4 it is humming in he rear end we had the rear bearings n seals changed new diff cover new fluid and it is still humming what is it??? PLEASE HELP!!!

99 Blazer driving hum,noise - Blazer Forum - Chevy Blazer Forums > ... > Steering, Suspension & Drivetrain
Dec 31, 2007 - 99 Blazer 4x4 has constant noise-humming that occurs non-stop and increases and ... Sounds like it is coming from rearend but not 100% sure. 99 LT 4x4 Rear End Whine
Nov 5, 2013
7-5/8 or 8.5" ring gear?
Jan 16, 2012
99 Jimmy 4x4 humming noise
Dec 24, 2009
More results from

Sep 30, 2015 | Cars & Trucks

1 Answer

There is a humming or whinning sound coming from my 1998 ford expedition while im driving. The sounds stops when i take my foot off of the accelerator.

if the sounds is comming from the rear sounds like crown and pinion is worn out , the crown and pinion in the rear diff will only hum or whine under load while in contact and when you let go the pedal there is no load equalling no noise. you can replace the crown and pinion but you do need some specialty tools like dial guages and spreaders and pinion depth guage

Dec 15, 2010 | Ford Expedition Cars & Trucks

1 Answer

Whine from rear end

Sounds like a pinion bearing or rear axle shaft bearing.

Jun 27, 2009 | 2001 Ford F150 Styleside SuperCrew

2 Answers

Rear end whine, 2001 S-10 Blazer

this means the ring and pinion gear are worn, but when u do the gears u will need to also replace all the bearings as well.

Apr 26, 2009 | 2001 Chevrolet Blazer

1 Answer

Rear end whine 2001 s10 4x4

If its low on fluid it could be the bearings in the end the axle tubes, i dont think the ring and pinion would be bad until you hear grinding sounds. hope that helps

Apr 26, 2009 | 2001 Chevrolet S-10

1 Answer

Rear end whining

if you have a constant whine that raises pitch the faster you go, you have improper backlash adjustment in the differential (rear end), if you have a whooping noise that whoops faster as you drive faster then you have a bad wheel bearing, both can be the result of low fluid level in the rear end.

Apr 09, 2009 | 1999 Ford Explorer

1 Answer

Rear diff leaking. how do i fill?

there is a fill plug on the side of the carrier housing on the nose of it, but if the rear end is noisy it is to late, u have damaged the gears or the bearings or both.

Mar 24, 2009 | 1999 Jeep Grand Cherokee

1 Answer

Lincoln town car 2000 - whine in the rear

Hi this is a common problem for these cars the whine noise is coming from the fuel pump and once they fuel pump starts whining the life of that pump is very short the best thing to do is replace the fuel pump and your fuel filter it shouldnt cost much mainly under $100.

Feb 03, 2009 | 2000 Lincoln Town Car

1 Answer

Low whine while under load

The pinion depth is incorrect in the differential. This can cause excess backlash, improper bevelled gear meshing, and permanent damage to the gear set. It can be repaired most of the time by changing the shims on the pinion to allow 0.010" more penetration o the pinion into the housing.

Oct 28, 2008 | 1999 Dodge Ram

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

180 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides