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  #37  
Old 07-30-2013, 11:57 AM
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Re: Front and rear diff fluid change

The weird thing is the document I got from this site does not specify GL-5. Redline makes both GL-4 and GL-5. Can anyone confirm it should be GL-5? I have QT1.
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  #38  
Old 07-30-2013, 12:03 PM
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Re: Front and rear diff fluid change

I can't tell, but I can tell you my dealer showed me a bottle of 05136035AA which is the "crossfire only" GL from Chrysler and is said GL4 on it... It also had a copywrite of 2003!

I'm thinking they now make it as GL5 same part number, but the dealer didn't have any new (because no one buys it for $45/qt!

I think the GL5 75w-85 in the manuals is there because a GL5 will work fine and not ruin anything.. I also think a 75w-90 is close enough... So I'm thinking Mobil 1 is my stuff. This service manager showed me a bottle they had on hand and basically said "this is what we use all the time", as have I in open diffs with good success..

See my last post as I added stuff to it.

edit: I see the mobil stuff in town is all "LS" now, which would probably be fine for a non LS diff, but I'll probably go with Amsoil severe gear 75w-90
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  #39  
Old 07-30-2013, 12:12 PM
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Re: Front and rear diff fluid change

Ok, seems like GL-5 should be good to go then. Why are you choosing 75w-90? Mobil doesn't make 85? Just curious.
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  #40  
Old 07-31-2013, 06:59 AM
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Re: Front and rear diff fluid change

Correct. I bought amsoil severe gear 75w90 and putting it in today. 75w85 is not a typical range i see... Again i can only say in my experience it works and the service man who seems well respected around town implied that as well.. A gl5 to me is a "better" oil in typical ways but per above it can cause some problems with brass or bronze syncros in trannies.. Of which i think we have none in the diffs.

Also note: the redline stuff they recommend for "crossfire" axles is their gl5 stuff too. So amsoil mobil and redline say it is good to go in diffs calling for gl4. Thats good enough for me.

If you want the right wt exactly in a gl5 or for a lot less than oem i would probably try redlines recommended stuff in above post.. Redline is very good but hard to find.

If you want gl4 looks like old oem crossfire stuff for a gazillion dollars is your bet.. Not sure if the new oem is gl4 or gl5, nor do i care anymore. 45$/qt is like hwy robbery.
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Old 07-31-2013, 09:46 AM
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Re: Front and rear diff fluid change

It would be nice if we could get the bolts measured so we can order magnetic plugs like: Jeep magnetic oil drain plugs

Seems like a PIA, draining, taking them off and running to a hardware store to measure the thread spacing or whatever you call it.
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  #42  
Old 07-31-2013, 11:11 AM
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Re: Front and rear diff fluid change

there's an o-ring on all 4 as well, I doubt you'll find a mag plug to fit.. Don't really know if it would help. It would probably be a giant mushroom soon enough as those gears do wear normally..

FWIW my jeep is a open diff V8 from 2012 (aug) and it has 21k miles pretty hard mostly hwy loaded (the car not me) and going fast and winter snow / ice and city driving.. little off road.. Both front and rear were "metallic" looking as is typical for old diff fluid but not too dark. Seemed about right time for first change, but I'm sure the oil was still good. I'll probably go at least 20K again, maybe 40 before next change. I just like to get the original changed early.

It's official, I used Amsoil severe gear 75w-90 GL5 front and rear. I'll post back once I get my 30mpg hwy ; )
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Old 07-31-2013, 08:56 PM
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Re: Front and rear diff fluid change

FWIW, the rear diff will have metal particulate in it from the clutch packs if you have an ELSD. This is normal.
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Old 07-31-2013, 10:15 PM
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Re: Front and rear diff fluid change

I agree... Mine are both open, but I'm not surprised of the metal sparkles, it's typical of diffs of any kind I've serviced.. They don't really make the oil less effective as the metal is not harder than the gears, it IS the gears!, but they do look "bad".. I'm sure there's only so much an oil can hold before it does lose effectiveness. I think it's more the issue of staying within spec for viscosity. But as not many OA's are done on gear lube, I just chose to change it early.
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Old 08-01-2013, 07:05 AM
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Re: Front and rear diff fluid change

Oil is cheap "insurance"! I always go by the severe schedule on fluids.
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  #46  
Old 08-12-2013, 08:41 AM
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Re: Front and rear diff fluid change

I changed my differentials and xfercase fluids to Red Line this weekend. I have had my truck for 3 years and I can say the difference is very noticeable. Runs very smooth... The easiest of the three was the transfer case.

Here are my findings for the QT1 system.

Front differential: the drain plug (8mm) doesn't have enough clearance to use a socket because of the oil pan. I used an L shape hex and a piece of tube for leverage. No issues with the fill plug.

Rear differential: the rear is 14mm. I had a similar issue with not having enough clearance because of the exhaust (don't remember if drain or fill plug). I was able to get the socket in and used an adjustable wrench on the socket to remove and screw back.

Transfer Case: no issues with clearance, piece of cake. This fluid looked the worst of the three at 52k miles.

I also had the issue where the fluid pump was larger than the bottles. I used black tape to hold it in. No major issues other than dropping an adjustable wrench on my forehead. But next time it'll be a lot easier/faster.
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Old 08-13-2013, 07:18 PM
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Re: Front and rear diff fluid change

Redline website says that they don't have a reccomendation for the transfer case on the QTII or QD. Not sure why that is. WK2jeep shows the same part # for the transmission as well as tranfer case oil, so I would think that Redline C+ ATF would work in both. What's everbody else using? I'm thinking I might go with their 75w85 for the diffs and maybe their C+ in the tranny. Still holding back on the transfer case until I get this cleared up.
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Old 08-13-2013, 10:37 PM
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Re: Front and rear diff fluid change

Quote:
Originally Posted by mbriddle View Post
Redline website says that they don't have a reccomendation for the transfer case on the QTII or QD. Not sure why that is. WK2jeep shows the same part # for the transmission as well as tranfer case oil, so I would think that Redline C+ ATF would work in both. What's everbody else using? I'm thinking I might go with their 75w85 for the diffs and maybe their C+ in the tranny. Still holding back on the transfer case until I get this cleared up.
Transfer Case needs an ATF+4. If Redline (or anyone) has an ATF+4 compatible fluid it should be ok.

I used Castrol ATF+4 in mine. (and Mobil1 75w-90 in the diffs F & R)

Case is an MP3023 (GM trucks use it as well and use Dexron VI)

Some tech info here:

http://www.pickupwiki.com/sites/defa...ansferCase.pdf

Note: this info is for QT2/QD2 equipped jeeps.
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