Differential Fluid

[GunnerSchenck]

Does everyone's manual say 75-90 but run 80-90? Or does mine just say 75 cuz it's 2wd and no trak-lok? Only difference I could really think of.
Picked up valvoline 80-90 but checked the manual after and realized I may have been wrong last time too lol just curious

 

[rjkj2005]

75/90 non towing street use. 75/140 for towing and off road use. Doesn't matter RWD or 4wd

Sent from my XT1585 using Tapatalk

 

[GunnerSchenck]

That's what I figured, but every thread on here says to use 80-90

 

[tjkj2002]

That's what I figured, but every thread on here says to use 80-90

80w-90 is the better gear oil for non-towing and little to no offroad use.

 

[GunnerSchenck]

80w-90 is the better gear oil for non-towing and little to no offroad use.

Appreciate it.. gunna change out the rear bearings tomorrow and just wanted to make sure. Gotta stop and pick up the seals after work though and a tube of rtv then I'll be ready.

 

[GunnerSchenck]

80w-90 is the better gear oil for non-towing and little to no offroad use.

I do a decent amount of dumb driving, not quite offroading but take a lot of hunting roads, oil roads etc.. and get stuck a decent amount in winter so the rear end does a fair share of spinning
This oil still good for this?

 

[Royy]

That's what I figured, but every thread on here says to use 80-90

I believe 75-90 is a synthetic weight, while 80-90 is dino.

 

[LibertyTC]

75w-90 dino works good. I do like it a bit thicker so it really sticks to gears when it gets hot.
Been using Lucas 85w-140 but in cold, takes a bit to warm it up Lol.
My next mix is going to be 70% dino 85w-140 and 30% synthetic 75w-90 just cause I can.
Ya here is the mixed results at 75-25 %...Link: http://www.jeepkj.com/forum/f196/rear-differential-gear-lube-61689/
ya I know...I sometimes come up with these mixing ideas... when I'm a bit drunk.gif :gr_grin: