icedenali

hey guys! i'm about to change my differential oil with streering fluid too.
what brand(thinking royal purple) and weight do Yukon denali use?
thanks

04BlackGmc

iTrader: (18)

LSD?

Should be 75-90 Full SYN

icedenali

yeah 75-90 both front and rear?
thanks

04BlackGmc

iTrader: (18)

front is 80-90

Wireman134

Royal Purple in Eddie Smith's NHRA race cars are faster than Mobil 1 fills (engine & drivetrain). Thats good enuf for me. Max Gear 75w90 in my diffs. There is less drag w/synthetic in front, I need more brake pedal to stop...

budhayes3

iTrader: (19)

I'm using GM 75-90 synthetic front and rear...the truck originally came with 80-90 dino oil in the front, but I read an old TSB in reference to transfer case issues in colder climates. Seems the autotrak can't overcome the thick viscosity of the dino gear oil and takes a poop (as per the TSB)

icedenali

I was thinking about Schaeffer's synthetic gear oil. I have hear good things about schaeffers! has anyone used it?...... compare to royal purple, how is it?

UBLUZIN03

iTrader: (1)

Can you elaberate on this? why would you put steering fluid in the diff?

icedenali

i'm NOT gonna put steering fluid into diff. why would I?
I said I'm going to change or add steering fluid into steering. Not to differential!

UBLUZIN03

iTrader: (1)

Okay just checking...