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Old 12-25-2010, 03:13 AM
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Rear Diff whine

Intresting thing turned up on my limited today. We have had a long trip, 7 hours, 600k..

Two hours into the trip i noticed at 98-106kmph the rear diff started to whine. It seems to be only on cruse and acceleration. Coasting down it quiet.

I had to swap to Redline shockproff due to boiling most fluids that i try due to the heavy towing we do (horses)

This is the oil i have put in, Which was recomended by lots of the 4wd specialists. http://www.redlineoil.com/product.aspx?pid=44&pcid=8

The crazy thing with this diff whine, Its quietish. But only located where my driving possition is. I move my head forward, its gone. Move it so the side, its gone. Drives me insane lol!

Im starting to think, that maybe i should of got the lighter graded stuff. The wierd stuff with redline is the ratings seemed to be measured diffrent
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Old 12-25-2010, 08:40 AM
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Re: Rear Diff whine

I think you ought to have the rear checked. I do a good bit of towing in the summer(4500# boat or 5500# camper and have never boiled gear oil. Also if you're hearing the noise close to your driving position you might want to check your transfer case because its about right underneath you. Keep in mind if it's a Quadratrac or Quadradrive you need a special synthetic Mopar t-case fluid.
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Old 12-25-2010, 02:51 PM
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Re: Rear Diff whine

The transfer has always had a light whine when cold. I had a full auto and transfer service done 2 months ago. The transfer fluid was very low and gray.. Pretty stuffed.

The diff boiling fluid problem is quite common here in NZ. I had been using 80w90 (non lsd) d44a.. But after reading i could of gone to the 75w140. But was told the redline shock prof will fix the boiling problem. Which it did

i never did think of the transfer case doing the whine. So it is possible. To get it rebuilt is hihgly costly here or to find a replacement. I only saw 3 wj GC's on our trip.. lol
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Old 12-25-2010, 07:38 PM
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Re: Rear Diff whine

When your T-case fluid was grey in color, it was or not changed for a very long time, or there was already some metal particles in the oil. I would start with checking the fluid level and if ok taking a sample of the oil after a short ride to see if its grey or with metal particles again. It can be that a bearing inside the T-case is getting bad.
The fluid which Jeep wants us to believe is a special "jeep only fluid", is in fact nothing more then Mobil 424 fluid.
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Old 12-27-2010, 01:00 AM
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Re: Rear Diff whine

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Originally Posted by Frango100 View Post
When your T-case fluid was grey in color, it was or not changed for a very long time, or there was already some metal particles in the oil. I would start with checking the fluid level and if ok taking a sample of the oil after a short ride to see if its grey or with metal particles again. It can be that a bearing inside the T-case is getting bad.
The fluid which Jeep wants us to believe is a special "jeep only fluid", is in fact nothing more then Mobil 424 fluid.
Good idea. Were driving back tomorrow. So will have to check when i get home. And yeah it didnt get the "offical fluid" But the mobil stuff...

This jeep hadnt been looked after to well before we go it., And im worried that something bad is about to happen.. e.g Transfer rebuild
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