how to rebuild a 1997 toyota 4 runner rear differential

A complete rear differential replacement includes replacing the housing, gears, bearings, and seals. The average time it takes a certified mechanic to perform a differential rebuild at a shop is usually three to five hours. A rebuild on a commercial vehicle by someone without prior experience could take much longer.

How hard is it to rebuild a rear differential? A complete rear differential replacement includes replacing the housing, gears, bearings, and seals. The average time it takes a certified mechanic to perform a differential rebuild at a shop is usually three to five hours. A rebuild on a commercial vehicle by someone without prior experience could take much longer.

How much does it cost to rebuild a rear differential? Depending on the make and model of your car, as well as its condition, expect to spend between $1,500 to $4,000. The other factor is if you buy a new rear-diff or a used/rebuilt one.

Can a rear differential be repaired?

A typical rear differential repair costs anywhere between $200 and $400. These typical repairs would include your bearing, seals, and fluid changes. Of course, when a gear change is required, that’s when things get pricey.

What happens when rear differential goes out?

Typically, when the gears wear out — or the bearings fail — the differential will start to howl. You’ll hear something that sounds like a deep whistling sound that goes up and down in pitch as you go faster and slower. Sometimes it’ll go away when you step on the gas.

What happens if differential fails while driving?

A failing differential [both front and rear] will make a whirring noise, whining noise, howling noise, and humming noise. These noises will gradually change during acceleration, deceleration, or when turning around the corner. … Simply put, excessive noise is a common bad rear axle shaft symptom.

Can rear differential cause transmission problems?

When the differential doesn’t perform well, it creates metal-on-metal friction that wears down surfaces. The resulting heat weakens gears and can cause component failure and transmission problems.

What kind of oil do I put in rear differential?

The construction and maintenance of front differentials mirror that of the rear on the same vehicle. Most differentials call for SAE 75w90 gear oil, however some heavy-duty and limited-slip differentials need SAE 75w140 gear oil. Consult your owner’s manual for the proper weight oil to use.

What causes a rear differential to whine?

Whirring… A “whirring” noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. This condition is typically always diagnosed as a bad ring and Pinion gear.

Why is my rear differential making noise?

If the cause of the noise is inside the differential, this can be due to either tight-meshing pinion gears, or too much backlash on these gears. Another cause could be worn out differential-case bearings, and these can also cause noise when turning.

What does a rear differential problem sound like?

The most common rear differential noise is a whirring sound, although it’s not unheard of to have a clunking or banging sound as you accelerate. … If you do hear a whirring noise, it’s going to remind you of what a worn-out wheel bearing sounds like.

What does a broken differential sound like?

The most common sound of a failed differential is a whining noise. This is often due to poor lubrication within the differential, meaning there is a good chance that the differential fluid is leaking. If you spot a reddish fluid under the differential, there is certainly a leak.

How do I know if my rear differential bearings are bad?

The classic sounds of a bad wheel bearing are cyclic chirping, squealing and/or growling noise. You can also tell that the sound is related to wheel bearings if it changes in proportion to vehicle speed. The sound can get worse with every turn, or it can disappear momentarily.

Should there be any play in rear differential?

If the rear end isn’t clunking, whining or grinding, then you’re likely seeing the play from the differential gears. Think about it, if you really had a lot of slack between the pinion and ring gear, you would hear it while driving. Now if you can wiggle the pinion left to right you would have a real problem.

How much backlash should a diff have?

Keep the backlash variation under 0.005″ if possible. In a perfect world no variation would be the goal. However, even with a straight case the backlash can vary 0.005″ without any negative consequences, so this is an area where each assembler will have to decide how much they are willing to allow.

How much play should driveshaft have?

3/4″ of rotational play, or slack measured at the outside edge of the u-joint flange? I would say that is fairly normal, but if you are having noise from the rear end, I would be pulling the cover off and have a look inside. Remember, it could be coming from a worn wheel bearing too.

What is a slip yoke?

Within many Jeeps, the slip yoke describes an internal splined shaft that’s connected to the driveshaft itself using a universal joint. The slip yoke is present to transfer power from your Jeep’s transfer case to the driveshaft, sliding in and out of the transfer case.

What happens if you dont mark your drive shaft?

Well, if its a single shaft driveline it doesnt matter and shouldnt make a difference. If its a 2 piece driveline, and you seperated the front and rear pieces with out marking which way they go together you have a 50/50 chance or putting it back in right, provided you didnt change any parts of the driveshaft.

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