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differentials

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Symptoms of a Bad or Failing Support Bearing
Common signs include unusual noises and shuddering during acceleration.
Symptoms of a Bad or Failing Differential Output Seal
Common signs include whining sounds and oil leaks coming from the differential.
Symptoms of a Bad or Failing Axle Shaft Seal
If there are signs of leakage, puddle of fluid, or the axle shaft pops out, you may need to replace your car's axle shaft seal.
Symptoms of a Bad or Failing Pinion Seal
Common signs include a leaking pinion seal, low fluid in the differential, and a whining noise while the vehicle is in motion.
How Does Traction Control Work?
It’s raining as you drive on a darkened highway late at night, but you never worry about safety. Your car has traction control. While you know the term, you may not understand what it...
How to Check Your Car’s Differential Fluid
Ever since you got your driver’s license, you’ve been to told to check your engine oil. But what about the fluids underneath your vehicle? If you’ve got a rear-wheel...
How Often Do I Need to Replace My Car's Differential Fluid?
Many folks do not even know what the differential does. It is not one of those common car parts like the transmission or radiator. In fact, some people go the entire lifetime of a...
How Often Does My Car Need New Transfer Case Fluid?
A transfer case is a part of a drivetrain system. Its primary function is to engage the axles of multi-axle vehicles. Positioned underneath the vehicle, a transfer case is made of an aluminum or...
How to Replace a Pinion Seal
A pinion seal keeps oil in the differential and keeps water, dirt, and debris out. A failing pinion seal will leak which can ruin the differential.
How to Replace a Differential Gasket
Differential gaskets seals the differential housing and protects the rear-end gears and axles from exposure to the elements.
How to Replace a Differential Output Seal
Differential output seals prevent fluid from leaking out of the differential, causing the differential to overheat and cause damage to your car.
What is Rear-Wheel Drive?
For the better part of the twentieth century, nearly every vehicle on the road had the engine sending power to the rear wheels. This arrangement makes a lot of sense to designers, with the...
How to Buy Good Quality Differential/Gear Oil
Gear, or differential, oil is used to lubricate the gears in a car’s transmission so that it can shift smoothly and easily. This type of fluid is generally used on standard transmissions,...

Related questions

Question
Will my transmission be ok after driving without differential oil?
Anytime you run a component without the proper lubrication, you run the risk of damaging the component. Once you install the correct amount of lubricant and drive it, you will find out in short order if running it without lube...
Question
Rear differential
Firstly, you will need equipment to safely raise and suspend the vehicle while working under it. A transmission jack or similar to support the exhaust (original system is 1-piece front-to-back) and the differential itself for removal and re-installation. Torx bolt...
Question
Whining when accelerating and slight grinding when letting off the gas.
Hi, thanks for writing in. I don't wish to 2nd-guess, but your symptom description suggests that either the differential or the transmission may have been run low on fluid, but was refilled after a couple of weeks? Not clear on...
Question
Front differential not working properly
Hi there, thanks for writing in. If the tires can be stopped and the driveshaft continues to spin, then there is an actuator assembly issue in the front differential. If the driveshaft stops spinning, then the problem may be in...
Question
Loud rough ride coming from the front of car.
Hey there, thanks for writing in to YourMechanic. There are many things this may be, ranging from front differential problems to an out of balance tire to bad wheel bearings. For an issue like this I would recommend having a...
Question
how munch does the rear differential hold?
Hello there, the fluid capacity of your 2002 Chevy Silverado 3500 rear differential is determined by a few different factors. The normal capacity is approximately 4 quarts. This changes based on if your truck is equipped with the limited slip...
Question
How many miles you need change differential oil
Hello, thanks for writing in about your 2001 Toyota Sequoia. The fluid change intervals should be listed in the owners manual for the vehicle. As a rule of thumb, the differential fluid should be changed every 30,000-50,000 miles. If you'd...
Question
Differential oil and spark plugs needed at maintenance?
Do not do the service unless they can tell you why this is needed since the owners manual does not recommend it yet. If there is a recall, then it should not cost you to get it done. Verify with...
Question
Removal of the rear axle from the rear deferential, any special way to do so? Pulling on it doesn't work.
There is a special axle remover tool or a slide hammer that can cause the axle to release from the housing.
Question
What is the life of differential oil?
Hi there, thank you for asking about your 2014 Lexus RX350. According to Lexus, this fluid doesn't need to be changed until 150,000 miles. It should be inspected every 50,000 miles and if the fluid is dirty it should be...
Question
Rear differential won't spin driveshaft, starts to turn then locks up.
Hello. If the rear differential will not spin with the vehicle off of the ground, then it has an internal failure or there is a failure in one of the rear bearings. I usually disconnect the axles first to isolate...
Question
Differential Grinding noise
Hello and thank you for contacting YourMechanic. First thing you need to do is check the oil in the differential. The lowest the oil can go to is one knuckle down when you put your finger into the fill hole....
Question
Knocking/fluttering in rear end
Hi and thanks for contacting YourMechanic. If you have a limited slip differential, then having 2 different size tires on the axle will cause the limited slip differential to make this noise. Eventually, the limited slip will stop working and...
Question
Rear end repair. I took the differential cover off and there were bearings inside.
Hello, thanks for writing in. When you open up a differential case you should see the differential gears, the ring and pinion. If the rear end is damaged or blown, you may see damage to the gears, or find metal...
Question
Rear end
Hello. On a vehicle this old, it is virtually impossible to tell what gear ratio was originally installed in your trucks differential, or what may be in there now. New vehicles tend to have a metal tag attached to the...
Question
Where can i put jack stands at in the rear?
Your owners manual will have the best diagram for raising the vehicle. You will see from the bottom that the frame runs along the outer most sides of the vehicle. This is typically the best spot to support a vehicle....
Question
I want to buy a 1997 Subaru Outback Wagon that appears to have oil/fluid leaks.
Hi there. There are three categories for leaks, that I use. Seepage (by all factory standards considered normal) collects dirt, signs of a leak (wetter than seepage) may or may not see it on the ground (monitor level), and a...
Question
Can failure of a transfer case cause damage to a differential?
Hi there. Based on the mileage of your vehicle, its possible that the seal could have gone out on its own. A dynamic seal (seal on a shaft) will last for up to 80,000 miles on normal conditions, however, this...
Question
can bent axle cause spider gear to break?
Hello, when you have a failure in the rear differential assembly the metal debris will ruin bearings. A shim kit may be required to set-up the diff. to proper specs. A bent axle can damage gears. There are measurements that...
Question
Rear axle housing oil leak - 2004 Dodge Ram 1500
Hello - there are several possible sources of the gearlube leak in the rear end housing: the pinion shaft seal, the large diameter area where the differential carrier is bolted to the rear axle housing, or the rear axle vent...

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