KingofMasonry

Is there a special procedure for cleaning out your differential if the wrong oil has been used in it or can it just be drained and refilled with the right stuff. I've got a 2000 f150 4.2 4x4 5speed. Not sure which rear end it had either. Any help would be appreciated

Scuba_Dave

What was the wrong oil that was used ?

KingofMasonry

gear oil. Later found out it calls for synthetic and some additive.

McCarthy

Just drain and fill with the correct stuff. I would wager as long as it's a decent quality dino gear oil you'd be just fine leaving it, however it would be a good idea to use what's recommended by Ford!