IF they replace the pinion seal, they had to retorque the crush washer and perform a pinon pattern. If that wasn't done right, then it could make noise.
SOURCE: pinion seal leaking
check your rear diff vent if pluged clean it out and clean up the pinion seal.sometimes if the leak is caused by pluged vent and has not been leaking long once vent is clean sometimes the leak will stop.there is not a specific torque amount because it is rotational torque(how hard to turn pinion).there is a crush sleve on the pinion and if torqued too tight or too loose brg preload will be wrong and brg damage could result.mark and remove drive shaft.remove rear wheels,brakes,axles.so when turning pinion you dont have any drag from brakes or axles.mark the position of the yoke on the pinion.remove yoke,replace seal,reinstall yoke be sure to replace pinion nut.tighten nut until it takes the exact same amount of force to turn pinion as before taking original pinion nut off.hope this helps.
SOURCE: leak at rear diff (pinion seal?) 03 4X4 ford ranger
the part is called the pinion flange seal, pull the drive shaft, remove the large nut on the flange the drive shaft connects to and remove the flange, then pry out the old seal and lube the lip of the new seal with motor oil and press it into the opening. The 7.5 hour estimate is way wrong, about 1.5 hours labor and $4 for the part.
SOURCE: In Aug 05, at 75K miles, my 2000 EB Ford Exp took
no they are not suposed to leak period if it is leaking there is some defect
SOURCE: I have a pretty severe leak from my oil pan. Is
Copied from "EHow" by By Zibahrose
Step 1
Purchase the gasket kit and quarts of oil from the local auto parts store. The customer service rep at the store can help you purchase the correct amount of oil and the right gasket kit for your vehicle.
Safely jack up the vehicle and place jack stands to support the vehicle. Lower the jack to rest the car on the jack stands before working on the vehicle. .......OR drive the car onto a curb on one side only to give you some working room under the car.
Fill engine with oil according to the vehicle specifications. Do not over fill.
SOURCE: A year ago I had the valve cover gasket fixed on
i would just try puting new gaskets in where it is leaking
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