Gear Lube Question

joshbea6

joshbea6

Registered User
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.
 
joshbea6 said:
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.
Click to expand...
Yes, it's a posi (or trac loc) additive from Ford. Use Mobil 1 synthetic for the gear oil.
 
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:
 
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.
 
Ford vs. GM

Hill1513 said:
Yes, it's a posi (or trac loc) additive from Ford.
Click to expand...
If you use the Ford Friction Modifier, it's for a Trac-Loc. Ford never used an Eaton Positive Traction differential.

68COUGAR
 
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