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Old 01-13-2010, 03:15 PM   #1
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Gear oil

Need to replace the gear oil in my 05 Rubicon. Front diff & rear diff. 75-140?, 80-90? What do you guys run? I'm in NY. It's between 0-35f right now.
Also, I have Rockcrusher covers. I think the fill plug is located above the original plug location. Do I fill to the hole, or just a certain amount?

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Old 01-13-2010, 03:31 PM   #2
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75/140 . . . you want to go with something that meets the GL-5 and J2360 requirements. Lot's of guys run Royal Purple . . . I've got it in my Rubi now and it seems to work fine, but that crap is close to 20 bucks a bottle so I'm going to check at WalMart and see if I can find their SuperTech 75/140 as I've heard that it's cheaper and has been tested and meets the J2360 requirements that even the pricer RPs and Amsoil don't necessarily meet.

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Old 01-13-2010, 03:32 PM   #3
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Fill to the bottom of the hole so long as the fill hole isn't that much above the OE cover's fill hole. And it's very important to not overtighten the fill hole plug bolt. Overtightening that bolt can cause it to protrude too deeply inside where it can (and does) impact with the carrier spinning around inside. The exact viscosity is not all that important since at that end of the scale, they're pretty darned close anyway. 75W-140 would be fine.
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Old 01-13-2010, 04:04 PM   #4
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I need to do mine too...don't know what I'm doing, good time to learn I guess.
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Old 01-13-2010, 05:07 PM   #5
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Fill to the bottom of the hole so long as the fill hole isn't that much above the OE cover's fill hole. And it's very important to not overtighten the fill hole plug bolt. Overtightening that bolt can cause it to protrude too deeply inside where it can (and does) impact with the carrier spinning around inside. The exact viscosity is not all that important since at that end of the scale, they're pretty darned close anyway. 75W-140 would be fine.
Hey Jerry . . . would you recommend that I fill up my rear diff with the Riddler cover to the bottom of the hole too? I know the cover has a raised fill hole to allow for the rotation of the diff, but I don't know how high and if it's designed to only take the right amount and then pour out or if I was to fill it up to the fill hole if that would be too much? At the time, I got the cover, I was told just to put in the stock amount, but if more would be better, I want to make sure I put more in as I'm about to service my diffs this weekend.

Mr. WOT - it's a very easy, yet messy, stinky, and time consuming job . . . at least it usually is the first time. Do yourself a favor and buy a lubelocker gasket so you don't have to mess around with the RTV and will only have to scrape all the old mess off the one time. Be sure not to overtighten both the fill plug or the bolts holding on the diff cover.
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Old 01-13-2010, 07:25 PM   #6
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Schmo, if your pinion hasn't been raised for a CV driveshaft, I wouldn't fill it all the way if the hole is substantially higher than stock. To be safe, I'd keep it below the bottom of the hole by the amount the hole is higher than stock. It's not that critical though I'd rather have a tad too much than not quite enough. Let's just hope your outboard axle seals are in good shape if you get too much in.
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Old 01-13-2010, 07:31 PM   #7
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Filling to the bottom of a hole means nothing. It's just an indicator.

The proper level is as much as it can hold, but still remain slightly below the bottom of the axle tubes. The oil should be able to drain back into the center. If it has too much there's always oil against the axle seals. Eventually enough will seep through to cause trouble.

Notice the bottom of the stock oil hole in the stock cover lines up slightly below the bottom of the tubes. Sometimes aftermarket stuff - covers etc - is off a little.
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Old 01-13-2010, 07:45 PM   #8
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Schmo, if your pinion hasn't been raised for a CV driveshaft, I wouldn't fill it all the way if the hole is substantially higher than stock. To be safe, I'd keep it below the bottom of the hole by the amount the hole is higher than stock. It's not that critical though I'd rather have a tad too much than not quite enough. Let's just hope your outboard axle seals are in good shape if you get too much in.


I do have a CV DS and have raised the pinyon with my UCAs . . . running 4" of lift.
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Old 01-13-2010, 08:42 PM   #9
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Fill 'er right to the bottom edge of the hole then.
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Old 01-14-2010, 01:38 AM   #10
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If you've done anything that rotates the the diff, up or down, the stock hole will not be in the right place.
It's easy to determine the right level, simply eyeball the bottom of the axle tubes, mark where it relates to the fill hole. It's not exact science.
If the level is too high you'll get leakage past the axle seals - onto the brakes - trouble.
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Old 01-14-2010, 05:12 AM   #11
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This isn't mine but just the same. See how hi the fill hole is? It would semm that if I filled it this hi and ran down the hiway at about 65 for a length of time my seals would go to crap. Hell, it would almost be full.
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Old 01-14-2010, 09:23 AM   #12
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You'll have to use your "calibrated" finger. Dip it in the hole downward to find the actual and proper level.

The lip seals are intended to stop the oil that gets "flinged" or "splashed" against them, they cannot hold the oil back like a dam.
Proper procedure is to fill to the bottom of the hole - IF THE HOLE IS IN THE RIGHT PLACE. If not you have to get a little creative.

In your picture with the hole way too high if you used the bottom of the oil hole as your mark, the axle tubes would be totally full of oil. Guaranteed the brakes would get wet.

The oil level should be approximately the same height as the BOTTOM of the axle tubes. Notice that's where the factory holes are - both front and rear, on almost any axle. Look at most any axle fill hole on most any live axle, any brand, any style. They are all the same. They position the filler hole like that intentionally.

That's why many "quickie" oil change places create lots of problems - the monkey fills the diff way too full to where it runs out past his filler, then "quick" puts the plug in before it runs out. He thinks he's doing you a favor by putting in so much oil. They have no clue!

Next thing ya know the brakes go bad - wet with diff oil. If that happens, simply leave the plug out a few minutes and let the excess drain back out.

This is one of those cases where too much oil is not good.
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Old 01-14-2010, 10:34 AM   #13
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So using this pic as an example, you would want to fill it up so that the level of the oil came up to about the bottom of where it says ROCKCRUSHER?
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Old 01-14-2010, 01:06 PM   #14
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Can it be simpler?
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Old 01-14-2010, 01:08 PM   #15
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Perfect...thanks rrich!

BTW...do you drive a flat (non glossy) khaki Jeep?
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Old 01-14-2010, 01:22 PM   #16
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Can it be simpler?

How did you write on my computer screen like that?!
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Old 01-14-2010, 04:32 PM   #17
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Perfect...thanks rrich!

BTW...do you drive a flat (non glossy) khaki Jeep?
Kinda - it's supposed to be metallic Khaki, but since it's usually dusty dirty it may look flat.
The distinguishing mark is the thin yellow and green stripe along the sides.

Where are you - your listing shows So Cal - that's a big place.
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Old 01-14-2010, 04:36 PM   #18
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How did you write on my computer screen like that?!
Look behind you - while you were getting rid of some of the beer you drank, I wrote it on your screen. What are we having for dinner tonite?


Simple actually, I copied the picture, then printed it. Then marked on the printed picture, scanned it and posted it. I must have double clicked when I posted it to get the double effect.

How did I get to your living room? Scotty scanned me there with Mr. Spock's help.
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Old 01-16-2010, 12:52 AM   #19
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Kinda - it's supposed to be metallic Khaki, but since it's usually dusty dirty it may look flat.
The distinguishing mark is the thin yellow and green stripe along the sides.

Where are you - your listing shows So Cal - that's a big place.
I'm in Chatsworth . . . I met a guy up in Big Bear staying at the Motel 6 there . . . I think he was from Landers, wondering if it was you???
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Old 07-02-2013, 09:48 PM   #20
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Old thread, but how many quarts did it take? I bought 2 royal purple 1 quart bottles... I'm assuming I'm 2 quarts short?
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Old 07-03-2013, 01:37 AM   #21
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Old 07-03-2013, 02:17 AM   #22
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Awesome thanks!

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