hi, sice I've send my truck at the garage for changing my differential oil,he's starting to kicking sometimes,but just when i start from a stop and I turn,a lot of people said that's the clutch pad on the differential whos making this noise,but the garage where i make my oil change put 75/140 syntec from penzoil, but no additive because he said that in this oil the additive is already on it,and i just have 120 000km. The job for changing this pad cost me more than 500 can $$ i juste want to make sure this is the good thing..can somebody help me??
sorry for my whriting english..im from canada and im not verry good!! thanks you verry much for your help

 

He is right, it probably is the differential limited slip clutches that are popping or chattering. Like you say, it is usually most noticable when making sharp turns at low speeds. The clutches are probably not worn out though. Even though the mechanic said the Pennzoil fluid had the additive already in it, either (a) he might be wrong or (b) it didn't have enough additive already in the fluid.

Trying adding a few ounces of the limited slip additive to the differential, or if you are not comfortable doing it, insist that your mechanic do it, or try getting another mechanic to do it