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joshbea6
12-11-2005, 08:28 PM
I just finished rebuilding the 2.73 Rear Differential out of my 1990 SC and I need to know what the best gear lube is to use in the Rear DIff. Also do I need to put any special additive into it?

Thanks.

Hill1513
12-11-2005, 08:30 PM
I just finished rebuilding the 2.73 Rear Differential out of my 1990 SC and I need to know what the best gear lube is to use in the Rear DIff. Also do I need to put any special additive into it?

Thanks.
Yes, it's a posi (or trac loc) additive from Ford. Use Mobil 1 synthetic for the gear oil.

Spider
12-12-2005, 12:35 AM
mybee try this MaxGear 75W90 for the rear limited slip differential
Royal Purple :) im gonna be putting this in my car after i put it back together :rolleyes:

Joisey Jim
12-12-2005, 01:54 PM
The spec calls for conventional 75W90 gear oil (3 pints + 4ozs of friction modifier should fill it). However if you go with synthetic then I'd use 75W140 plus a synthetic modifier (like Redline). Ford now specs the 75W140 synthetic for almost all diffs.

68COUGAR
12-12-2005, 04:40 PM
Yes, it's a posi (or trac loc) additive from Ford.
If you use the Ford Friction Modifier, it's for a Trac-Loc. Ford never used an Eaton Positive Traction differential.

68COUGAR