Question about 1991 Toyota 4Runner

1 Answer

Rear diff whining noise

G'Day Just brought a 91 4runner to find there's a whining noise when driving that seems to be coming from the rear diff. Old man reckons could just be low on oil. is there a way to check and refil oil in rear diff if neccisary. Or any other suggestions on what the prob is? Thanks :)

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 1,959 Answers

Give the old man a pat on the back! There is an oil plug on the rear differential. On a level surface, remove the plug; if oil starts to flow out, the fluid is full. If no oil flows, carefully put your finger in the hole and feel for the oil level. Your finger should go no lower than the first knuckle before you feel oil. If it goes further, you are low on oil and should either fill it up or better yet replace it. Rear axle oil doesn't get replaced nearly often enough in most vehicles and since your truck is 18 years old, would be a bad idea to have it changed. Best of luck.

Posted on Jul 13, 2009

  • Greg Margossian
    Greg Margossian Jul 16, 2009

    Kindly rate the solution provided if you feel it answered your question. Thank you very much.



1 Suggested Answer

  • 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.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

There is a whining noise coming from my automatic transmission on my bmw330ci. the faster i go the louder it seems to be.

No it will not -now all BMWs are rear wheel drive so a whinning noise i would assume to be a diff so ask a local mechanic to check it out for you to have a proper idea what the problem is

Aug 07, 2014 | BMW 330Ci Cars & Trucks

1 Answer

Why is my 02 mountaineer not kiking into gear I hear a whining noise coming from tranny it's a v8 all wheel drive

Well, I can think of a couple of things. Number 1, are you sure the noise isn't comming from your rear diff. The independent rear end isn't as strong as the solid 8.8 axles of the older mountaineers. The toe links go out, and it causes the axles seals and rear bearings to go out. However, in this case I would look at the axle seals going into your rear diff. carrier. If it looks like your leaking, you could be blowing out the limited slip diff in the rear end. That would make a whining noise, and a lack of power because of the diff spinning instead of the tires. Now as for the transmission, that could be bad news. Ford does have a TSB for one of the internal parts wearing a groove in the casing. If I remember correctly it is one of the shift solinoids. That could be another cause the truck itself not going into gear. On the other hand some of the older Explorers had problems with the valve body gasket and that can do the same thing. So you may want to just change the valve body gasket and see if that fixes the problem before you have your whole trans remained. I know I threw a lot at you, especially with that added stuff about the rear end issues, but that is all items you might want to check.

Dec 02, 2013 | Cars & Trucks

1 Answer

I have a rear whinning noise when i drive i checked diff fluid and filled and still have noise only happens when driving

It can be gear whine, bearing whine, it needs to be listened to by a tech to decide which, but generally the gears are noisy only at certain speeds that would be around 45-65 MPH and it would come and go with being on and off the throttle. Bearing noise is there all the time.

Sep 18, 2012 | 2000 GMC Sierra

2 Answers

My rear end is making a whining noise as I drive

check gear oil and pray the bearing ant mess up because it sound like you fried the bearrings

Jan 26, 2010 | 2005 Ford F-150

3 Answers

Whining noise coming from back on my 316i e46 bmw could the oil in dif be low..

Hi, there, Check your break pads. Could be from there.

Nov 10, 2009 | 2000 BMW 3 Series

3 Answers

Rear end

clunking or grinding noises, wont accelerate to full potential,

May 07, 2009 | 2001 Ford Ranger Regular Cab

1 Answer

Rear diff fluid is a milky color and it whines while driving

Sounds like there is water getting into the diff. Most of the time it is from the vent on the top. That will cause damage to the bearings and make noise.

Mar 09, 2009 | 2001 Jeep Wrangler

2 Answers

ABS Light Came on and Loud Whining in Rear End?

Well you can remove the sensor in the diff and make sure that looks ok they g obad quiet often also woulnd not hurt too remove the rear diff cover and inspect the rear end if it is whining and you dont see anything wrong i would refill it with lucas oil/grease and start praying check the pinion too and see if it has any play in it

Jan 17, 2009 | 2004 Ford Ranger

1 Answer

1995 xj6 read end noise

likely the diff if a whine or if a clonk over bumps the rear shock bushings

Aug 31, 2008 | 1995 Jaguar XJ-R

Not finding what you are looking for?
1991 Toyota 4Runner Logo

794 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

79123 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

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

Answer questions

Manuals & User Guides