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-   -   Differential Fluid? (http://www.clubcobra.com/forums/shop-talk/56829-differential-fluid.html)

Timbo 08-19-2004 01:54 PM
Differential Fluid?
 
Just wondering what kind (brand name) and weight and how much of differential fluid everyone else is useing in there 9 inch ford 31 spline (narrowed about 9 and a half inches) rearend differentials?:confused:

Anthony 09-03-2004 05:26 PM
The best diif fluid is probably the synthetic stuff. I use Mobil 1 gear lube, something like 75w-90. Redline makes a synthetic gear lube as with some other companies. Even though it is for use in limited slip diff's, I was starting to get some clunking, so I had to add some of the limited diff additive as well.

You fill it up to the level of the fill plug, half way up the diff housing.

Jack21 09-11-2004 09:17 PM
Mobile 1 synthetic diff oil with a bottle of Ford friction modifier added for the posi. Fill to the bottom of the fill plug.

SCOBRAC 09-11-2004 10:25 PM
Mobile 1 or other good synthetic for an open differential. FYI I used it in my 20k mile salisbury and it made noise. I now use 90wt Valvoline designed for posi / powr loc units.

BMK 09-13-2004 08:12 AM
Yes use the Valvoline also. A small ratchet fits nicely in the drain plug to assist with removal. Front drivers/left side Don't overfill.

Cheers

Bernie


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