A
pinion seal is a rubber or metal ring that is used to prevent oil from leaking out of the differential unit in a vehicle. It acts like a barrier, keeping the oil sealed inside and protecting it from dirt and debris.
Full definition
Hello - there are several possible sources of a differential fluid leak:
the pinion seal, the axle flange seals, or the rear differential cover gasket.
A 2016 service conducted by the selling dealer included changing the differential fluid and
pinion seal, transmission fluid, shift lever seal, and engine oil.
so far replaced rear main seal,
pinion seal, & left front axle.
Master Overhaul kit for Dana 44 rear differential, 30 spline Includes carrier and pinion bearings,
pinion seal, shim kit, ring gear bolts, pinion nut and crush sleeve, oil slingers and baffles and marking compound and brush