post #1 of Old 10-08-2010, 07:47 PM Thread Starter
PSYCH0
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Best Differential Gear Oil?

Changing my Stock Differential Covers to Rancho Covers... what's the best Differential Oil to use? Is there a synthetic available?


2009 Jeep Wrangler JK, 2-Door, Soft Top, Automatic, Black Procomp Aluminum Wheels with 315x75R16 Goodyear Wrangler Duratracs, 2" Black Diamond Lift, JKS Adjustable Track Bars, Smittybilt Rock Rails
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post #2 of Old 10-08-2010, 07:51 PM
MAJTodd
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I use Amsoil products in my Jeep and Corvette from front to rear.

First Jeep the govt. hasn't owned.
Others: C6 Vette and Ducati bike.
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post #3 of Old 10-08-2010, 08:28 PM
Swagger
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Lucas!
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post #4 of Old 10-08-2010, 08:28 PM
armedsks
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I got amsoil in my rears also. 75-90 in the fron and 75-140 in the rear. I also have mobil1 on my shelf.
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post #5 of Old 10-08-2010, 08:48 PM
NorthRiver
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I use Mobil 1 or Royal Purple.
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post #6 of Old 10-09-2010, 02:17 AM
montero1
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Rear Oil

You won't find a better than gear oil than Amsoil "Severe Gear". Redline makes good gear oil as well, those would be the only two I'd use, and unless you constantly submerge the axles in water, would be good for 75k. If you chose to go with Amsoil, I can get it for you @ cost.
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post #7 of Old 10-09-2010, 06:38 AM
JohnRodriguez
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Richmond synthetic 75w140

89 Wrangler, 2.5L TBI, D30 Truetrac 4.56 gear front, Super 35 4.56 gears rear, 31" BFG Mud's, 15x9" weld racing pro-stars XP's, 2.5" rancho and 1.25" shackels, superior axles. rear wilwood disc brakes

2008 wrangler x unlimited. Stone white. Motech 5.3L LS Chevy
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post #8 of Old 10-09-2010, 06:44 AM
JeffinWesternWA
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CLEAN is best, ....I have had great luck over the years with REDLINE fluids in quieting, smoothing shift problems, reducing clutch chatter, etc., for a full synthetic. It's priced less than the botique oils and is usually available at retail jobberts/chain stores in many areas of the country...follow manufacture specs for weight and GL class though!

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post #9 of Old 10-09-2010, 03:55 PM Thread Starter
PSYCH0
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Royal Purple 75W-90 $20 a Quart!

2009 Jeep Wrangler JK, 2-Door, Soft Top, Automatic, Black Procomp Aluminum Wheels with 315x75R16 Goodyear Wrangler Duratracs, 2" Black Diamond Lift, JKS Adjustable Track Bars, Smittybilt Rock Rails
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post #10 of Old 10-09-2010, 05:01 PM
tjkj2002
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For HP diffs(if your lucky enough to have them) the best is the cheapest dino gear oil(85w-140),the best protection your diff can have.It has been proven that synthetic gear oil is not the best choice for your diffs,and yes I know almost all vehicles now have it from the factory but you also have very low drain intervals.The #1 reason for synthetic gear oil use is mpg's and that is it,you will loose some mpg's with dino gear oil but your diff will be better protected.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #11 of Old 10-09-2010, 06:24 PM
NorthRiver
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Quote:
Originally Posted by tjkj2002 View Post
For HP diffs(if your lucky enough to have them) the best is the cheapest dino gear oil(85w-140),the best protection your diff can have.It has been proven that synthetic gear oil is not the best choice for your diffs,and yes I know almost all vehicles now have it from the factory but you also have very low drain intervals.The #1 reason for synthetic gear oil use is mpg's and that is it,you will loose some mpg's with dino gear oil but your diff will be better protected.
How exactly is an inferior oil (dino) going to protect better than synthetic?

Lets see the proof.
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post #12 of Old 10-09-2010, 06:39 PM
Unknown303
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Canola oil FTW.
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post #13 of Old 10-10-2010, 12:29 PM
boostedboxer
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Do we use oil with friction modifiers or not, I would guess in the Rubi you wouldn't? How about in the tranny?
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