Differential Additive

S

Strawman

New member
Noob question of the day (although it was debated on another site for a while)


On a JKU Rubicon does the rear differential require limited slip additive?



Also for the most part are people running the 80w90 or the 75w140?
 
Peak

Peak

New member
The manual recommends 75w-90, that's what I run as well as many people on this forum. As for the limited slip additive, I'm not to sure since I don't own a rubi. I'm sure another member will chime in on that.
 
wayoflife

wayoflife

Administrator
Staff member
You do NOT need to use friction modifier in a rubicon axle. That being said, pretty much all synthetic gear oil has it in it and if that's what you're using, it really doesn't matter.

As far as weight goes, I would use what is recommended in the manual unless you're running 5.13 gears or higher. At that ratio, I might consider a heavier weight fluid.
 
Ddays

Ddays

Hooked
wayoflife said:
You do NOT need to use friction modifier in a rubicon axle. That being said, pretty much all synthetic gear oil has it in it and if that's what you're using, it really doesn't matter.

As far as weight goes, I would use what is recommended in the manual unless you're running 5.13 gears or higher. At that ratio, I might consider a heavier weight fluid.
Click to expand...

I've never heard that tip before (heavier oil with 5:13 or higher) - why is that?
 
ScoobyCarolanNC

ScoobyCarolanNC

Active Member
Ddays said:
I've never heard that tip before (heavier oil with 5:13 or higher) - why is that?
Click to expand...

Once the mechanics of the diff change so do the oil's requirements. Oil primarily does 2 things, lubricate & dissipate heat. As it gets hotter oil gets thinner & doesn't lubricate as well. The gear manufacturer should tell you what to run and how much once you upgrade.
 
jeeeep

jeeeep

Hooked
manual recommends the heavier weight oil when towing (load). with all the add-ons and off-road use, I figure that's reason enough to use the heavier recommended oil to try and keep things as cool as possible.
 
Ddays

Ddays

Hooked
ScoobyCarolanNC said:
Once the mechanics of the diff change so do the oil's requirements. Oil primarily does 2 things, lubricate & dissipate heat. As it gets hotter oil gets thinner & doesn't lubricate as well. The gear manufacturer should tell you what to run and how much once you upgrade.
Click to expand...

jeeeep said:
manual recommends the heavier weight oil when towing (load). with all the add-ons and off-road use, I figure that's reason enough to use the heavier recommended oil to try and keep things as cool as possible.
Click to expand...

Gotcha, that all makes sense, I just never heard to go heavier because of a ratio change before....
 
You must log in or register to reply here.
Top Bottom