Front and Rear Diff Fluid

[Jobofly]

Hey so I want to change my diff fluids since i did a lot of towing this summer. I am only at 17,000 miles but i know it cant hurt. My question is whether i need a diff fluid that includes friction modifier additive for either the front, rear or both.

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[Casique]

You do in the rear if you have the limited slip - Trac–Lok® Anti–Spin Rear Differential?

 

[firemarshallvin]

Should not, you have a locker in the rear and an open diff up front, so no. Just use a solid synthetic and you're good.

 

[Jobofly]

Not sure which one I have.

 

[Great Offender]

Not sure which one I have.

Under Standard Equipment = Tru-Lok Rear Axle unless you have it replaced by "Optional Equipment" which is not visible in the photo.

 

[Jobofly]

Ok i do not show anything like that under optional equipment. So it looks like i dont have limited slip in my rear axle.

 

[AverageJoe]

You have a Tru Lok - an electric locking rear differential.

 

[Jobofly]

Normal synthetic it is. Thanks everyone

 

[Maximus Gladius]

Double check with your dealership parts department and VIN #. They will confirm or deny what you need to know.

 

[Renegade]

75W-140 in the rear if you tow a lot.

 

[Maximus Gladius]

I have the 21 JTR, electric lockers and my rear diff calls for limited slip oil and front does not. Does your book mention anything on it?
EDIT: Tru loc does not call for LS fluid so I made an error statement above.

 

[firemarshallvin]

I have the 21 JTR, electric lockers and my rear diff calls for limited slip oil and front does not. Does your book mention anything on it?

Where does it call for the LS additive? It's only needed for LS units that uses clutch packs. If you have a locker, you don't need it. Rubicons have front and rear lockers.

 

[Maximus Gladius]

Where does it call for the LS additive? It's only needed for LS units that uses clutch packs. If you have a locker, you don't need it. Rubicons have front and rear lockers.

This is what my book says on pg 462. Parts department confirmed my VIN and needing LS oil in the rear. Maybe Tru-Lock and trac-Lock are different beasts.

 

[Maximus Gladius]

I just called up the dealership parts and I have the true loc front and rear and it does not require LS fluid.

 

[Maximus Gladius]

So, I thought I’d just call another dealership and they said it doesn’t matter if you end up putting LS oil in a non LS diff. “The additive is cheap insurance and won’t do any harm if it’s used”.
@ShadowsPapa might want to chime in

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