Join Date: Mar 2007
Location: Hickman Nebraska
depends on what you have.
i'm sort of partial to castrol synthetic.
royal purple is always good, but its expensive as all hell.
and then you have to think about whats inside that diff, the traclok units need an additive for the clutches.
and if you have the old clutches, and you don't want them to chatter, non syn oil + additive. some say syn is fine, I'm running it now without problems. but i upgraded the clutches to the carbon fiber.
in the end though, gear oil is gear oil. most just put in the cheep stuff and forget about it. and with a standard open spider gear diff, thats completely fine, the oil usually outlasts the car. ive seen diffs with stock oil at 100k+ that's still light tan and viscous. I'd still change it regularly though.
RUST!! eating away at me more than the rear fender wells
95 Deep Jewel Green 40th Anniversary Bird / Stock SOHC 190k 96-97 intake swap, 97 Mk8 4R70W, Jmod, 3L27 / energy susp rear spindle, and cobra arm bushings, 93 Mk8 shaft, and LCAs, 225/60r16 on Windstar twin 5spokes, Vogtland 1.6drop springs, Tokico Blues, PBR, and rear-disk swap, 89 SC swaybars
Last edited by nall_one; 06-06-2013 at 08:47 PM.