Question about Mercury Mountaineer

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Differential fluid low?

While driving my 98 mountaineer AWD if I let off the gas for traffic and then begin to accelerate again there is a grating noise from the rear end very similar to driving over rumble strips. I replaced the ujoints on the rear driveshaft and it is still doing it. could it possibly be low differential fluid? any other suggestions?

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  • 179 Answers

Yes.low on fluid will damage the bearings open the cover and look for burn fluid or metal shavings. replace all seals and bearings. Torque pinion bearing to specs use new crush washer on pinion shaftDont forget friction modifier and recommend gear oil.
Good luck.

Posted on Mar 23, 2014

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Posted on Jan 02, 2017

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SOURCE: Rear end noise from front wheel drive car

At that mileage it could be, and most likely is given your description of the noise. I assume it reduces in volume as you slow down. If you can find a quite piece of road drive up to where the noise is apparent and lightly swerve from left to right. (Don't roll the car!! ) If the noise reduces as you swerve left then its the left bearing. If its when you swerve right that the noise reduces its the right bearing. If its both the only way is to jack the rear up and spin the wheels as fast as you can and listen. If there's a hint of a rumble from it, its that bearing or both. It should be completely quite apart from the slight hiss as the shoes rub on the drum.
35K may not seem much but if you don't know the history of the car it could have hit a bad pot hole or even had a knock on a kerb.
I have replaced bearing with a lot less miles than yours.

Cheers John

Posted on Dec 17, 2008

  • 5 Answers

SOURCE: Rear differential driveshaft seal leak.

Hello,you need to remove driveshaft to be able to get to the nut.Remove the nut (MAY BE VERY TIGHT) and pull the yoke or flange as you called it out & you can pop old seal out & new seal in.You may want to smear a tiny bit of grease or vasoline on outside of seal for easier installation & also on the rubber part of seal so itwon't get damaged when you re-install the yoke.Hope this helps.

Posted on Dec 29, 2008

mcgyver468
  • 710 Answers

SOURCE: Cause of noise in front differential of 1997 Subaru Legacy Outback.

there is a plug on the shaft-side of the differential. Using a ratchet remove the plug and with the engine OFF, stick your finger inside the hole and you should get fluid just below the threads of where the plug goes in.

Posted on Apr 24, 2009

  • 187 Answers

SOURCE: Rear differential / axle noise and vibration.

A drive shaft that has lost a balancing weight will vibrate between 40 and 50 mph. If not corrected this could damage the input shaft bearing and seal on the differential causing oil leakage. Differentials are fairly indestructible but if run without oil will fail.
As for the front end you should never run the 4wd on dry pavement. The front differential is a posi traction unit that will turn both wheels at the same rate unlike the rear diff that will allow the inner wheel to turn slower than the outer on turns.

Posted on May 08, 2009

  • 4 Answers

SOURCE: There is a loud noise coming from the rear end

Had something like this with my much loved 6 cylinder Camry. Turned out to be a wheel bearing. You can check by raising the rear wheel off the ground with the jack and if you can move the wheel in and out, you need a wheel bearing. And it is a safety issue - when bad enough the wheel can come off the car, definitely a life changing experience. Check both rear wheels, just take a few minutes of your time. Don't believe the Elantra or any other front wheel drive car has a differential, those are used in rear wheel drive vehicles.

Posted on Sep 20, 2009

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