hey guys looking to buy some gear lube for my rear axle. 1998 expy 4x4, any online spots for a cheap price. thanks...

 

Make sure you use synthetic, and the friction modifier for the limited slip.

 

ford say to use their brand only, is this true...

 

You don't have to. I bought the synthetic gear lube and friction modifier from my local Napa and haven't had any problems at all.

 

no but the gear lube you replace it with must be the same qauilty and meet or excced the specs. mobil does not say if they do or not but RP and RD meet the ford specs. try www.karlracing.com about 9.00 a quart and free shipping.

 

here is the specs

 

Since it only takes about 3 quarts for a fluid change, plus modifier, and is only done infrequently, if ever, why not just go with the Ford stuff? My 2000 Expy seems to not like anything unFord. Perhaps it is me, but I find that the Ford specs are very high and you know what you are getting.

 

use royal purple gear lube in the rear and you don't have to use the friction modifier......