Question about 1984 Toyota 4Runner

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Rear differential noise - 1984 Toyota 4Runner

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  • carnac Jul 25, 2008

    Please excuse the orginal post as I'm new to this group. ;)



    Anyway the rear differential whines when the truck is driven. I assume it to be the axle bearings. Does anyone know if this is a common problem with 2001 4Runners? Can the axle bearings be replaced without disassembling the whole differential?



    Thanks….



  • adowning Nov 12, 2008

    rear axle bearings need to be replaced and manual says to take out shaft assembly and take in to shop to get bearings press.ed of shaft I would like to do it myself...but is special press needed or can normal mechanic tools suffice.Advise what is entailed to do work.

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Replacing rear axle bearings needs disassembling but only up to the back plate of your brake system. you dont need to disassemble the third member. Just pull the axle shaft. Normal mechanic tools wont suffice. youll need a press machine to do this job.

Posted on Nov 20, 2008

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Loud noise coming from rear end. Started yesterday and noise happens when truck is cold, but once it warms up no noise


Check the rear differential for leaks. Look behind both tires. If it is wet , the bearings and seals need replaced. I would put a bearing kit in the differential.

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You must have a 4 Wheel-drive. You should have a driveshaft for that end of the vehicle and you should not let the Mechanic keep it. The rear unit must have a bad Pinion bearing or more damaged parts. Some of parts can "freewheel" without having power going through them.

But the metal shavings from broken parts can travel inside the differential and cause more problems. You don't always need the 4-wheel drive function and you do not have it since the Mechanic disconnected it.

Sometimes it can be what is called an "axle" bearing. Each side has this part so you have 2. The noise levels for this part can also change when the 4 wheel drive is engaged.

Make sure the rear differential has lube. Read the Web for articles about your vehicle. Search "2003 Ford Escape rear differential".

There is a Salvage yard site called Car-parts.com which is good for locating used parts like differentials. One would need to match the same gear ratio as the front.

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1 Answer

Have a 2004 Avalanche 1500 that has rear end noise that get louder turning to the right and goes away turning to left. Also upon excelatation noise not so loud coasting noise get louder have checked rear...


Suspect a worn left side spider gear or it's bearing in the differential. If a limited-slip differential, the left side clutch may be grabbing somewhat. In any case, the differential will need to be removed from the case to service any worn or defective components. Rear end service is not for inexperienced mechanics. Have you checked the fluid level in the differential? Hope this helps!

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1 Answer

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The axle probably lost a keeper ring on the inside of the differential and the pieces may be going through the differential and ring&pinion gearing making the noises you hear. You will need to drain the oil out, find the broken pieces, and inspect all gearing for broken/damaged teeth, and for any noisy bearings. Flush the case out with cleaning solvent. Re-insert the loose axle after cleaning and inspecting it well--especially the interior end. Replace the keeper (new) on the axle end inside the differential spider gearing. Inspect the brakes on the loose axle side for any oil deposits and for any damage that might have been caused when the axle came out. If the differential is badly damaged, it might be cheaper to find another rear end in a wrecking yard. Hope this helps!

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1 Answer

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This could be one of several problems: If the noise increases with speed, and you are only hearing it from the rear differential and not the transmission, it could be the rear differential carrier bearings, or rear axle bearings going bad. If you are only hearing the noise upon acceleration or deceleration, the rear differential ring and/or pinion gears may be going bad and the rear differential will need an overhaul. You'll have to get the rear wheels off the ground and see if you can pinpoint the location of the noise with something such as a stethoscope. If it's coming from the rear differential, you'll need to pull the bolts and the cover to determine if the gears are still in good shape, or if there is any pitting. Same with the carrier bearings; if you see pitting/ discoloration, they'll need replacement. If the noise is coming from one side towards the end of the axle shaft near the wheel, it's most likely a axle bearing going bad, and you'll need to pull the wheels, remove the diff. cover to release the C clip which holds the rear axle in place at the differential, and pull the axle out. You also need a special tool with a slide hammer to remove the axle bearing and seal.

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1 Answer

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Check the U joints, there more common to go bad then the differential, unless you are low on differential fluids. You can take it to a drive line shop and have them replace the u joints and differential fluid and also have them readjust the ring and pin in the differential to give you more life out of the rear end. Good luck and keep me posted. Be glad to answer any questions you may have.

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1 Answer

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The mechanic speaks the truth.The diffs in these did have problems.Its a common occurence.Hope this helps

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1 Answer

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Bad rear differential or rear wheel bearings. Good Luck

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