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Unread 12-19-2012, 07:31 AM   #1
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.

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-98 ZJ Limited 5.9L - 4.5" lift, 32" Mickey Thompson MTZ's, Tomken rocker guards, D44 rear, 3.73's, LSD, 4xDoctor D30 guard, custom projector HID headlights, custom intake, LED lightbar, underdrive pulley, trans vent tube - Wheeler/Bad Weather Rig
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Unread 12-21-2012, 05:02 PM   #2
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.
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Unread 12-21-2012, 06:18 PM   #3
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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Unread 12-26-2012, 01:37 PM   #4
PAFirefighter11
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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.
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-Please contact us at user ID "Quadratec" with any Sales or CS questions. You can also contact Sales at 1-800-745-2348 or Customer Service at 1-800-745-6037
-The statements in this message do not necessarily reflect the opinions of Quadratec, Inc.

-98 ZJ Limited 5.9L - 4.5" lift, 32" Mickey Thompson MTZ's, Tomken rocker guards, D44 rear, 3.73's, LSD, 4xDoctor D30 guard, custom projector HID headlights, custom intake, LED lightbar, underdrive pulley, trans vent tube - Wheeler/Bad Weather Rig
-98 Pontiac Firebird Trans Am WS7 - 5.7L LS1, 6 speed, K&N FIPK, Flowmaster cat back, Pioneer system - Summer Cruiser
-01 Pontiac Firebird Trans Am WS6 - Toy
-03 VW Golf TDI (Diesel) - Commuter
-Former Jeeps: XJ, YJ, XJ, YJ, TJ, ZJ, ZJ
-Rick Rotondo Photography - Nikon D2x, lots of glass, lighting, tri & monopods, and other gear
-FDNY 9/11/01 - All gave some. Some gave all.
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