Who has preformed a differential oil change - JeepForum.com

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post #1 of 89 Old 10-23-2008, 05:43 PM Thread Starter
Bville-Bud
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Who has preformed a differential oil change

Is there a drail plug and a fill plug? Or is it like the old school differentials where you crack the rear case and fill back up?

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post #2 of 89 Old 10-23-2008, 06:40 PM
LTrainGC
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There is a fill and drain plug on the front diff. On the rear diff, I removed the cover to drain and then filled in the fill hole (which was covered with a rubber stopper deal). The rear was easy to fill, could just fill right from the bottle of fluid. I used a fluid pump for the front diff... I would imagine it would be a PITA without it.

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post #3 of 89 Old 10-23-2008, 06:42 PM
TonyVideo
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Did you replace the gasket on the rear diff? Or is there a gasket?

Tony
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post #4 of 89 Old 10-23-2008, 07:00 PM
LTrainGC
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Quote:
Originally Posted by TonyVideo View Post
Did you replace the gasket on the rear diff? Or is there a gasket?
No gasket, used RTV.

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-2005 Jeep Grand Cherokee Limited-
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post #5 of 89 Old 10-23-2008, 07:02 PM
TaosBob
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Quote:
Originally Posted by TonyVideo View Post
Did you replace the gasket on the rear diff? Or is there a gasket?
You use black RTV. But I have heard you can get a gasket in case you need to take it on and off frequently, like to check for water.

Traded in on 2012 Hyundai Azera: 2007 Grand Cherokee Laredo, Rocky Mountain Edition, Bright Silver, 4.7L V-8, factory hitch and tow hooks, Mopar rock rails, Mopar skid plates, Rusty's 2-inch BB with shocks, cabin air filtration. Firestone Destination AT tires 255/70/R17, 4xGuard skids--front, rear, and belly, BDS rear diff guard, OME rear shocks.
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post #6 of 89 Old 10-23-2008, 07:17 PM Thread Starter
Bville-Bud
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I wonder if anyone makes an aftermarket rear differential cover with a drain plug.
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post #7 of 89 Old 10-23-2008, 07:26 PM
no-blue-screen
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I was wondering about this myself. It would be nice to have a mag-hytec style with fins and a dipstick.

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post #8 of 89 Old 10-23-2008, 07:56 PM
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I havent checked but I suspect that the d44 rear has the same gasket that all other d44 have used for years. If this is the case, you can get a gasket pretty cheap in case you dont want to mess with the rtv. Either way is fine. Also this means any aftermarket D44 cover will work too. I usually warm up the axles before draining by doing some errands before the drain.

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post #9 of 89 Old 10-23-2008, 08:15 PM
LTrainGC
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I think only the SRT-8 has the D44.

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post #10 of 89 Old 10-23-2008, 09:08 PM Thread Starter
Bville-Bud
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Quote:
Originally Posted by LTrainGC View Post
I think only the SRT-8 has the D44.
you are right, but I've heard my axle is very close to the 8.25, so maybe there is hope there.
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post #11 of 89 Old 11-21-2008, 10:31 AM
Jscheier
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Can anyone with a 2008 GC CRD QD2 check their rear cover? My friend has a 2wd CRD and his cover has both drain and fill plugs. If that is the case, I'm going to pick up a 2008 cover from the dealer and pop that on.

Edit- Just went to the local Jeep dealer and every GC on the lot had a rear cover without a drain plug. All were 4wd. Could it be a 2wd vs. a 4wd issue? Maybe a different cover because of the E-diff?

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Last edited by Jscheier; 11-21-2008 at 12:08 PM.
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post #12 of 89 Old 11-22-2008, 01:43 PM
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Quote:
Originally Posted by Bville-Bud View Post
I wonder if anyone makes an aftermarket rear differential cover with a drain plug.
Mag-Hytec Covers have a drain plug. I had them installed on my Ram. I had my dif's serviced at the dealer and all they did was suction the oil out if the rear dif and refill, they didnt even remove the cover to clean-out!

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post #13 of 89 Old 11-22-2008, 06:07 PM
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I just performed the differential maintenance on my 2007 CRD and it wasn’t too bad of a job. The worst part was the price that I paid for the gear oil. I had stopped at NAPA to get the gear oil and they didn’t have the friction modifier. So I drove across town to the Jeep dealer to get the friction modifier. While there, I decided to have them sell me the gear oil as well to save me trip back to NAPA. Bad idea, the dealer charged me $30 per quart and you need three quarts. The modifier want too bad at $7.50 for the four ounce bottles. The final tally was about $105 for the gear oil and friction modifier. Needless to say, next time I will get the fully synthetic gear oil at NAPA and the modifier only at the dealer.

For the front, you need a 14mm hex head socket to remove the drain plug and the fill plug. After draining the oil into the pain, I sucked it out with my extractor and measured it at about 1.2 liters which is just short of 41 ounces. It is cold out in Minnesota today so I had the bottles of oil and modifier in the oven at about 150 degrees. On the front, you can easily get the small 4 ounce bottle of the friction modifier to the fill hole and squeeze it in. With the quart jugs it is a bit more difficult but it can be done. Cut the bottle top off and then stick the cap back on. Slip the bottle between the cross member and the engine block. When you get the nozzle up next to the fill hole, pull the cap and squeeze it in. For the front differential I put in the 4 oz of modifier, one full quart and then an additional 5oz from a second quart of gear oil. The total volume back into the front was 41oz.

The rear differential is a piece of cake if you have an extractor. After finishing the front, I took it out for a 10 mile ride to get the gear oil nice and warm. I then pulled the plug and had an assistant pump on the extractor while I went underneath and stuck the suction tube in the rear fill hole. After sucking out everything it measured in at just under 2 liters on the extractor. Again using the oven warmed modifier and gear oil, I filled the rear diff with 4oz of modifier, the 27oz of gear oil left from topping off the front and then a full additional third quart for a total of 63 ounces.
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post #14 of 89 Old 11-22-2008, 06:10 PM
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Quote:
Originally Posted by LTrainGC View Post
I think only the SRT-8 has the D44.
If you have the 3:73 gears and the V8 you have the D44. I think is started for the 07 model. Scroll down to the 07 year.
http://www.wkjeeps.com/future_Jeeps_archives.htm

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post #15 of 89 Old 12-02-2008, 09:07 AM
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As a note for anyone who wants to drain and refill the diffs, make sure you FIRST remove the fill plug! Why? Because if you drain the oil and can't remove the filler plug you are screwed.

It hasn't happened to me but I have heard of the horror stories and don't want to take a chance.

Shimmy.
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