QDII Diff and T-case fluid change - JeepForum.com
 
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post #1 of 14 Old 12-16-2011, 08:50 AM Thread Starter
LordEnki
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QDII Diff and T-case fluid change

06 WK QDII. Unknown km since last fluid change. I'm totally capable of performing the work myself, but have limited access to a garage at this time. The dealer charges $359.00 + tax to change t case and diff fluids, front and rear. Does this sound reasonable? Or should I suck it up and freeze for a few hours in the driveway?

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post #2 of 14 Old 12-16-2011, 09:51 AM
hoaxci5
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I'd be on the driveway for that price.

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post #3 of 14 Old 12-16-2011, 09:51 AM
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Well, you would spend maybe half that on fluids and probably 2-3 hours if you did it yourself. Very easy diy job.

~Mike~


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post #4 of 14 Old 12-17-2011, 05:38 AM Thread Starter
LordEnki
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I've read that fluid capacity for the rear diff is about 75.5 ounces and there is supposed to be 4 ounces of friction modifier also. Is that 4 ounces included in the 75.5 or on top of that? So I guess I'm saying: gear oil plus modifier equals 75.5 or 79.5?
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post #5 of 14 Old 12-17-2011, 05:43 AM Thread Starter
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Also, is there a brand of gear oil that anyone can reccomend or is the dealer stuff the way to go? Seems pretty expensive at the dealer.
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post #6 of 14 Old 12-17-2011, 05:58 AM
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I use Mobile 1 75W-140 synthetic for the front and rear diffs. Not sure on the modifier because my diffs don't require it (QTII). The Tcase oil I got from the dealer - Mopar NV245. These fluids aren't cheap no matter what brand you go with. Aside from Royal Purple being the priciest, the diff oil will run about $18-$22 per quart. The tcase oil from the dealer I wanna say will run about the same per quart, but my memory is a little fuzzy on that.

~Mike~


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post #7 of 14 Old 12-17-2011, 06:05 AM
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Quote:
Originally Posted by JeepN4KC View Post
I use Mobile 1 75W-140 synthetic for the front and rear diffs. Not sure on the modifier because my diffs don't require it (QTII). The Tcase oil I got from the dealer - Mopar NV245. These fluids aren't cheap no matter what brand you go with. Aside from Royal Purple being the priciest, the diff oil will run about $18-$22 per quart. The tcase oil from the dealer I wanna say will run about the same per quart, but my memory is a little fuzzy on that.

Those are same fluids I used, very easy DIY job.

As far as teh friction modifier I wouldnt get worried about the exact ounces just fill your diff's on a level surface until it begins to seep out and you will know they are full. Just fill them slowly, especially the transfer case.

Here is a couple good how to videos:



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post #8 of 14 Old 12-17-2011, 07:41 AM
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good job on the video, very informative, one question, don't you have a drain plug on the front diff?( that makes it even easier)
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post #9 of 14 Old 12-17-2011, 09:35 AM
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Originally Posted by GregK340 View Post
good job on the video, very informative, one question, don't you have a drain plug on the front diff?( that makes it even easier)
yeah, the front does so it is cake. You just have to remove the skid plate to get to it. The 100% correct way would be to remove the rear cover, but pumping it out works as well.

Driving around for a bit to warm all the fluids helps them drain as well.
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post #10 of 14 Old 12-17-2011, 10:20 AM
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I will say I've done the rear diff both using the "cheater" method and pulling the rear diff cover. Personally, I would recommend pulling the cover off, completely draining it, cleaning it with brake cleaner, clean the cover and scrape all the old sealant off, new bead of rtv around the outer edge of the cover to include around the bolt holes(I used the red), reset the cover but don't torque all the way, let the rtv "skin over" for about 20 minutes then come back and torque all the bolts EQUALLY (30ft-lbs torque in a star pattern). Let the rtv "set" for about an hour and refill the diff oil. It sounds alot more involved but it really isn't that much more work than the pumping all the old oil out method and it is just a more complete job. You can let the rear "set" while you do the front diff and/or tcase. With the front diff, yes there is a drain plug. Make sure you open the fill plug before the drain plug because if the fill plug is ceased and you've drained the front diff - well you're screwed.

~Mike~


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post #11 of 14 Old 12-17-2011, 11:25 AM
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Just to complete the usefullness of this thread, he also has videos of the transmission fluid too. Not sure if he does it properly, but it'll at least give you an idea. I really need to do all the fluids sine I don't know if the previous owner ever did (got it used from a stealership).


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post #12 of 14 Old 12-17-2011, 11:37 AM
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Quote:
Originally Posted by t3kmitch View Post
Just to complete the usefullness of this thread, he also has videos of the transmission fluid too. Not sure if he does it properly, but it'll at least give you an idea. I really need to do all the fluids sine I don't know if the previous owner ever did (got it used from a stealership).

http://www.youtube.com/watch?v=81tt6...feature=relmfu
I've watched all his videos myself - very informative. I might, repeat, might try to do the tranny service myself. This is the one that I don't know about diy-ing, though. Seems messy and some of those bolts look like they'd be tough to get to when I crawl under my rig to look around.

~Mike~


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post #13 of 14 Old 12-17-2011, 11:46 AM
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Originally Posted by JeepN4KC View Post
I've watched all his videos myself - very informative. I might, repeat, might try to do the tranny service myself. This is the one that I don't know about diy-ing, though. Seems messy and some of those bolts look like they'd be tough to get to when I crawl under my rig to look around.
I thought about it too, but I am just gonna take it to the dealership....anything transmission related (except transfer case fluid) I dont trust myself to mess with
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post #14 of 14 Old 12-17-2011, 01:32 PM
t3kmitch
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Also figure in he's doing these videos at stock height. A simple 2in lift with some tires will give you a few more precious inches of room. I can get access to a lift if/when I attempt mine which i think will make it much easier than laying on your side.

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