I'm about to have my gears and the new girdle installed, I was just wondering if I should have the shop put friction modifier in the rear end, and if so, how much? Thanks.
Unless you are using a synthetic gear oil like Redline or Royal purple you absolutely need it...It takes a 4oz bottle of it then top the rest of the rearend off with gear oil...
See my website below - I did test several synthetic lubes with and w/o friction mod.... the only thing I can't attest to still is Redline's gear lube w/o friction mod, but I've "heard" it works fine.
but yes - use friction mod, 4 oz, no matter what the gear lube mfg. tells you - just to be safe. It won't hurt a thing.