Question by nervous: Where to put posi-trac oil additive in rear axle? 1997 mustang cobra?
need to put posi-trac oil additive in the rear axle of my mustang cobra. Got under there and looked around a little bit but couldnt see where to put it.

Where does it go and any other tips would be great. Thanks!
not seeing it anywhere
is it on the backside or the front side?
whats it look like?

Best answer:

Answer by baseballplayer22
there should be a fill plug close to the top of the diff.

What do you think? Answer below!

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