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  #13  
Old 06-19-2009, 03:27 PM
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Re: WK Front and Rear Differential Fluid Change

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Originally Posted by dreamer1213 View Post
Jeep actually recommends to change the fluid in the diffs every 12K miles.

I did mine on my 02 Overland with Quadra-Drive by myself, all for about $120, where if they dealer did it, it would have been $600 for the diffs and transfer case...

All depends on if you want to do it yourself...or let someone else do it...

Huh, it cost you $120 for the oil?
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Old 06-19-2009, 06:21 PM
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Re: WK Front and Rear Differential Fluid Change

I did fully synthetic from Royal Purple, you don't need any additive with that stuff, i believe it's 90 weight??
If you go full synthetic, i will recommend you do the transfer case as well, very easy to do! buy some gasket maker, brake cleaner so when you open up the rear cover, you can spray the heck out of the gears to dissolve the old oil. if i remember correctly, the front has a drain plug.. i think i still removed the cover so i could spray and clean that too ( i drive my wk in deep mud) TC has a drain plug, drain it, refill and plug.
I bought an oil pump to keep the garage a bit cleaner when filling up the TC, hope this helps.
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Old 06-19-2009, 06:27 PM
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Re: WK Front and Rear Differential Fluid Change

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Originally Posted by TimmyB View Post
Huh, it cost you $120 for the oil?
It cost me $120 for the following...and its everything needed to change the diff/transfer case oil. I'll have to check my receipts...may be it was less...lol...

2 quarts Mopar NV247 transfer case oil
4 quarts Royal Purple 75W140
8 oz of Mopar Addative
1 tube of RTV Silicone

Even tho Royal purple says that there's a Limited Slip additive already in it....the Quadra-Drive in my WJ didn't like it with the additive...so I added that too...
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  #16  
Old 06-20-2009, 12:59 PM
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Re: WK Front and Rear Differential Fluid Change

thanks for the responses guys! AcidCold.. how much did changing everything over to the royal purple fluids run you? does anyone else agree that it is a worthwhile change? and running just the royal purple without any mopar additive in the axles? also i have heard before to change the transfer case, but i thought everyone was saying to stick with the mopar fluid in there?

Thanks for all the help guys!! Hopefully I can get this job done very soon!!

-Chris
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Old 06-20-2009, 01:45 PM
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Re: WK Front and Rear Differential Fluid Change

Not sure how much it would be for the required quartz since i stock up on that stuff, good to have extra so when i'm wheeling and need to change it out on the spot (due to water crossings) last oil change i spent $200 which was on engine, axles and tc.
Amsoil is very good stuff as well fyi..
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Old 06-20-2009, 02:18 PM
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Re: WK Front and Rear Differential Fluid Change

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Originally Posted by ahamay115 View Post
thanks for the responses guys! AcidCold.. how much did changing everything over to the royal purple fluids run you? does anyone else agree that it is a worthwhile change? and running just the royal purple without any mopar additive in the axles? also i have heard before to change the transfer case, but i thought everyone was saying to stick with the mopar fluid in there?

Thanks for all the help guys!! Hopefully I can get this job done very soon!!

-Chris

I do whatever the manuel in the glove box says. I check everything off on the "Maintenance log book schedule B" I have. I am due for my differentials any time now. Do you have one of those, great to keep track of everything.

As far as brands of oils, like Royal Purple compaired to brand X everyone has there own opinion. But here is mine, I use all sythetic and go with good name brand when its on sale. Like the AdvanceAuto near me has 5 quarts of Mobile 1 sythetic oil plus Mobile 1 filter for $29.99 so I stocked up for the next year of changes. If you keep up with the scheduled changes I think the over priced Royal Purple is a waste and not needed. In my 94 GC I never even changed the differential or transfer case oil and I traded it in with 227,000 plus miles on it with zero transmission problems.
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Old 06-20-2009, 02:26 PM
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Re: WK Front and Rear Differential Fluid Change

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Originally Posted by AcidCold View Post
I did fully synthetic from Royal Purple, you don't need any additive with that stuff, i believe it's 90 weight??
If you go full synthetic, i will recommend you do the transfer case as well, very easy to do! buy some gasket maker, brake cleaner so when you open up the rear cover, you can spray the heck out of the gears to dissolve the old oil. if i remember correctly, the front has a drain plug.. i think i still removed the cover so i could spray and clean that too ( i drive my wk in deep mud) TC has a drain plug, drain it, refill and plug.
I bought an oil pump to keep the garage a bit cleaner when filling up the TC, hope this helps.

I'd be carefull about spraying cleaner on the gears. Some of the residue is still left on, then mixes with the new oil breaking it down, plus the residue on the gears might affect the oil from coating them properly. Like when changing the engine oil you dont go and spray the inside down, but instead the contaminants come out when draining the oil. I would not start messing with removing any covers, but instead just drain the old oil and refill with new at regular intervals. Especially for the home mechanic that really doesnt know what they are doing but just wants the oil changed. Stick with the maintenance schedule recommended by Jeep and you will be fine.
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Old 06-20-2009, 03:32 PM
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Re: WK Front and Rear Differential Fluid Change

I agree....I didn't spray cleaner in on my gears either for that same reason..

If you don't change the diff oil....they will, and I repeat...will start to whine...might take a 100K miles...or less....diff oil loses its lube abilities just like engine oil....you change you're engine oil every 3K miles, but don't do the diff's every 12K...It'll catch up with you...and you'll end up spending alot more to get the gears replaced....unless you don't mind whining gears...

Ohh...my ZJ's front and rear diff howled...and I mean like there was 2 wolves riding along with me..I was the 3rd owner...and got it for my b-day...so I didn't have a choice..it was already doing it....take care of you drivetrain! Its worth it..
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  #21  
Old 06-20-2009, 09:22 PM
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Re: WK Front and Rear Differential Fluid Change

Darn! an here i thought i was doing a good thing! that explains me rear whining sound!!! i have done that to the rear a few times and once for the front, never for the tc thought.
Reason for the spray was due to having water mixed with my oil, i guess i will start avoiding that, thanks guys.
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  #22  
Old 07-22-2009, 05:58 PM
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Re: WK Front and Rear Differential Fluid Change

hey guys, looking for an update on this... any definitive ideas on which brand of fluid is best to use in the differentials? It seems that synthetic is a good idea, but do I still need to add the mopar additive or can I go without it?

Thanks guys! Trying to get this done soon, but don't want to screw anything up...this jeep has to last forever!! lol!!
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  #23  
Old 07-22-2009, 06:21 PM
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Re: WK Front and Rear Differential Fluid Change

You absolutely need to run the Mopar friction modifier in a QDII system, suggestions you don't need to are dangerous. A dealer can sell you only as much as you need (100ml per diff from memory).
You can use any brand oil that has the equivalent specs required as per the service log (it's in the handbook).
I do exactly this and send it to a normal mechanic I trust, not the dealer. Cost is about half of what the dealer wants to do the job.
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  #24  
Old 07-22-2009, 07:12 PM
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Re: WK Front and Rear Differential Fluid Change

Marlin is correct.

I used Mobil 1 75W140, buy 4 quarts of it. Should be between $15 and $18 a quart at advance or autozone.
You need two bottles of the diff additive from the dealer - 4oz bottles each - one for the front and one for the rear diff. Also need a tube of RTV to seal the rear diff. The front has a drain plug.

I know the manual says to change the diff fluids every 15K - I've got about 18K on this fluid and I just checked it yesterday. Still at the right level, looks clean, and smells fresh. I'd recommend it.
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