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post #1 of 4 Old 12-19-2012, 07:31 AM Thread Starter
PAFirefighter11
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Gear Oil

Anyone have any comparison charts or tests out there on gear oil for the D44a? I'm debating between Royal Purple, Mopar & LSD additive, etc.

Edit, read a little on Bob is the Oil Guy and it seems RP is fine. So I'm going that route.


-Rick R
-2015 JKU - 3.5" JKS JSPEC Kontrol, 315/70R17" MTZ's, 17x9" Quadratec Rubicon Xtreme's, JCR bumpers & skids, JW Speaker tails, Dirty Dog netting/screens, Quadratec Auto Mirror Movers, etc
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post #2 of 4 Old 12-21-2012, 05:02 PM
jokerchief462
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I have been using Royal Purple products for years and it is in my YJ now no issues after a year. It costs a few bucks but when I was hot rodding I used it in everything engines gearboxes and rears. Maybe I am just stuck on the brand.

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

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post #3 of 4 Old 12-21-2012, 06:18 PM
Jerry Bransford
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Our axles are not fussy about their GL-5 gear lubes and any major brand like Valvoline, Castrol, Mobil, Shell, Pennzoil, Royal Purple. etc. will be just fine and protect as well as any. Your rear axle only needs the LSD additive (a friction modifier) if it has a Tracloc limited slip differential.

However, hardcore axle manufacturers have stopped using synthetic gear lubes. Surprisingly and as hard as this will be for the synthetic lube enthusiasts to swallow, they found that the ring & pinion gears in our axles actually run cooler in high stress situations with conventional gear lube than they do with synthetic. They didn't believe it either, it took some very sophisticated test jigs & procedures to confirm that finding that surprised everyone. Many, like Currie, now insist their customers only use a conventional gear lube in their axles and will void the warranty if a blown axle comes in filled with a synthetic gear lube.

For example, look at the directions on Currie's instruction page, go to Step 5. http://www.currieenterprises.com/ins...ions_adder.pdf

For Joe-average Jeeper not doing hardcore competition-level wheeling however, a synthetic gear lube is fine.

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post #4 of 4 Old 12-26-2012, 01:37 PM Thread Starter
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Quote:
Originally Posted by Jerry Bransford View Post
Our axles are not fussy about their GL-5 gear lubes and any major brand like Valvoline, Castrol, Mobil, Shell, Pennzoil, Royal Purple. etc. will be just fine and protect as well as any. Your rear axle only needs the LSD additive (a friction modifier) if it has a Tracloc limited slip differential.

However, hardcore axle manufacturers have stopped using synthetic gear lubes. Surprisingly and as hard as this will be for the synthetic lube enthusiasts to swallow, they found that the ring & pinion gears in our axles actually run cooler in high stress situations with conventional gear lube than they do with synthetic. They didn't believe it either, it took some very sophisticated test jigs & procedures to confirm that finding that surprised everyone. Many, like Currie, now insist their customers only use a conventional gear lube in their axles and will void the warranty if a blown axle comes in filled with a synthetic gear lube.

For example, look at the directions on Currie's instruction page, go to Step 5. http://www.currieenterprises.com/ins...ions_adder.pdf

For Joe-average Jeeper not doing hardcore competition-level wheeling however, a synthetic gear lube is fine.
Jerry, thanks. I have an LSD in my D44a on my 5.9L ZJ. I beat on the Jeep since it's a winter DD, tow rig, and wheeler. I ended up with some Royal Purple 85w140 Max Gear gear oil through a friend who has a dealer account with 'em. Interesting about dino gear oil. I'll have to look into that.

-Rick R
-2015 JKU - 3.5" JKS JSPEC Kontrol, 315/70R17" MTZ's, 17x9" Quadratec Rubicon Xtreme's, JCR bumpers & skids, JW Speaker tails, Dirty Dog netting/screens, Quadratec Auto Mirror Movers, etc
-03 VW Golf TDI - Diesel
-Rick Rotondo Photography
-FDNY 9/11/01 - All gave some. Some gave all.
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axle comparison , gear oil , mopar , royal purple

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