Skip the auto shop - Our mechanics make house calls

Q: What is the difference between a pinion seal and a pinion flange?

asked by on

What is the difference between a pinion seal and a pinion flange?

My car has 117 miles.
My car has an automatic transmission.

Hello there, thanks for your question.

The pinion flange is a part of the rear differential housing that the driveshaft bolts to. The other end is attached to the pinion gear inside of the differential.

The pinion seal is what seals the oil inside of the differential and keeps it from leaking around the pinion flange. These seals wear out over time and will require replacement.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. What is the difference between a pinion seal and a pinion flange?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck not starting consistently

Hello. First, I am assuming your vehicle has an issue with the starter. Voltage drop testing should be performed between the starter and the battery. This will tell you if the is a loss of contact between the battery and...

Q: my jeep will start right up, idle for about a minute then pudder and shut off. But i can start it right back up.

The only way to isolate the problem is to monitor the fuel pressure and spark along with the crankshaft and other sensors when it dies. This will tell me if you are losing fuel, spark, or a sensor like the...

Q: Gasser to diesel?

Hi there, thanks for writing in your question. As with any project, anything is possible with the right amount of money, patience, and time. I have seen a few of these conversions done, and there are kits out on the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...