What to know about the Pinion Seal all about:
Vehicles with rear wheels as drive wheels, drive shafts, differentials, and transfer cases are used to transmit power from the engine and transmission to the wheels. In a front-wheel drive setup, CV axles join the transmission directly. However, in rear, all and four-wheel drive setups, that’s not the case. With regards on the make and model you own, you may have a single driveshaft and differential, a front and rear differential (in the case of all-wheel drive) or some other setup.
In these systems, drive shafts are used to convey movement/power from the transmission to one or more differentials. While they’re all different, they do have a few similarities. Each differential will have a pinion shaft – a short shaft that attaches to the pinion gear inside the differential and terminates in a flange. The pinion shaft attaches to the driveshaft.
Each pinion shaft will have a pinion seal, which is used to make sure that fluid does not leak out of the differential past the pinion shaft. Depending on the setup, you may have a rear pinion shaft, or a front and rear pinion shaft.
Facts to Note:
The rubber pinion seal will wear and eventually require to be changed.
Pinion leaks should be inspected at each service interval.
Low fluid in the differential can hurt gears.
How to Fix:
The vehicle is lifted and held on jack stands and the drive shaft is removed
The defective pinion seal is detached
The new pinion seal is fixed
The drive shaft is installed and the vehicle is removed from jack stands
The vehicle is started and checked for steering operation
Whether you have a four-wheel, rear-wheel or all-wheel drive vehicle, it’s vital that you keep your differential in good working order, and that means maintaining the right fluid level. As the fluid level drops, gears wear and friction increases. We greatly recommend having any pinion leaks examined by your expert mechanics as soon as you can.
Common symptoms indicating you may need to changethe Pinion Seal:
Fluid leaking at the pinion shaft
Low fluid in the differential
Differential whining during operation (a sign of low fluid and/or damage)
Importance of this service:
Without an operational differential, your vehicle can’t be driven; therefore, it’s essentialthat you keep the right fluid level. Any leak can quickly drop the fluid to unsafe levels, and serious pinion leaks can cause problems very quickly. Have your vehicle repaired by your expert mechanics, who will keep an eye on your entire vehicle during regular upkeep and analyze any differential fluid leaks.