Rubicon Diff Fluid Question - Page 2 - JeepForum.com

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post #16 of 32 Old 07-21-2010, 10:19 AM
Jerry Bransford
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I might have misread my '04 manual but I did read that section yesterday out of curiosity after seeing this thread. I'll have to re-read it again later today to verify what I read.


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post #17 of 32 Old 07-21-2010, 10:24 AM
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The reason I asked if RogueSpear looked at the rear specs, or just the front, is because for the front Rubi D44, it does say 80W90 -or- 75W140 syn., if towing.

Let us know about the 2004 info!
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post #18 of 32 Old 07-21-2010, 10:27 AM
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i didn't see anybody mention this but it was noted in the manual a few posts back, limited slip additive for the rear...
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post #19 of 32 Old 07-21-2010, 10:29 AM
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Quote:
Originally Posted by Jerry Bransford View Post
The front diff's viscosity doesn't need to change for towing because the front axle is not engaged when towing. The Rubicon's rear diff's recommended viscosity is 80W-90 unless you are towing, then the recommended viscosity becomes 75W-140.
I wouldn't have believed it either if I hadn't read it. Who tows in 4WD? What diference does trailer wieght make on a free spinning front axle? I guess that's why we have the engineers.

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post #20 of 32 Old 07-21-2010, 10:29 AM
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wanna read this later.
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post #21 of 32 Old 07-21-2010, 10:30 AM
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Quote:
Originally Posted by ajamison View Post
i didn't see anybody mention this but it was noted in the manual a few posts back, limited slip additive for the rear...
No additive is needed for the Rubicon. It has the "Tru-lok". The "Trac-lok" is the limited slip offered in some non-Rubi rear axles.
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post #22 of 32 Old 07-21-2010, 10:31 AM
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Originally Posted by ajamison View Post
i didn't see anybody mention this but it was noted in the manual a few posts back, limited slip additive for the rear...
If the fluid you buys says for use in limited slip diferentials it already has the modifier in the bottle. I've not seen a quality synthetic fluid that did not come with the friction modifier pre-installed. That's why you don't hear about it in a Rubicon specific thread. That and the whole trac-loc vs. tru-loc thing...

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post #23 of 32 Old 07-21-2010, 10:31 AM
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Quote:
Originally Posted by dirt_j00 View Post
No additive is needed for the Rubicon. It has the "Tru-lok". The "Trac-lok" is the limited slip offered in some non-Rubi rear axles.
oh i thought the rubicon rear axle had a limited slip and a locker... my mistake
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post #24 of 32 Old 07-21-2010, 10:32 AM
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Quote:
Originally Posted by Zen View Post
I wouldn't have believed it either if I hadn't read it. Who tows in 4WD? What diference does trailer wieght make on a free spinning front axle? I guess that's why we have the engineers.
I think it's a screw-up and there have been errors in past FSMs, notably like when they mistakenly recommended a GL-5 gear lube for the AX-5 and AX-15 transmissions.

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post #25 of 32 Old 07-21-2010, 10:53 AM
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I have had issues when towing starting on a hill (dirt road), and used 4WD Hi, I found it helped me get traction faster, and once I get going (or off the hill) I switch back to 2WD

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post #26 of 32 Old 07-21-2010, 03:11 PM
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Quote:
Originally Posted by ajamison View Post
oh i thought the rubicon rear axle had a limited slip and a locker... my mistake
It does. It's a gear driven limited slip, not clutch...
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post #27 of 32 Old 07-21-2010, 03:12 PM
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It does. It's a gear driven limited slip, not clutch...
Which means it doesn't need the additive.

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post #28 of 32 Old 07-21-2010, 03:24 PM
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If you look at the tags on your axles from the factory it will say

75W-140 on the rear tag...

and either 80w-90 or 75W-140 for the front depending on when it was made.

and to the OP:

DO NOT over-tighten your rear diff fill plug. The FSM says 30 ft lbs and it's wrong...you want to snug the plug and turn it about 1/4 to 1/2 turn...just so it does not leak. my plug seals at 17 ft lbs.

Over-tightening the fill plug will drive the magnet (on inside of plug) into your locker acuator and make bad things happen..very bad things.

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post #29 of 32 Old 07-21-2010, 04:06 PM
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Originally Posted by solarpower View Post
DO NOT over-tighten your rear diff fill plug. The FSM says 30 ft lbs and it's wrong...you want to snug the plug and turn it about 1/4 to 1/2 turn...just so it does not leak. my plug seals at 17 ft lbs.

Over-tightening the fill plug will drive the magnet (on inside of plug) into your locker acuator and make bad things happen..very bad things.
YEP. Learned that the hard way. Just wrap the threads of the fill plug with some teflon tape and tighten until snug.

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post #30 of 32 Old 07-21-2010, 04:12 PM
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I suddenly have the urge to go back and loosen off my plugs, I think I snugged them to 25 ft lbs....eep. Will I only notice this when it comes time to engage the lockers? Haven't been offroad yet, so I haven't had a reason to engage them.
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