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  #1  
Old 04-19-2010, 07:58 PM
ndgo88 ndgo88 is offline
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Default Rear diff service

Hey guys!

I'm fairly new to this site but have some info that may be valuable for some 4.7L owners. I have a 2004 1500 QC. I changed out my rear diff fluid two Saturdays ago and found a piece of a metal clip on the magnet. My truck is at the dealership now getting the rear end rebuilt. It would have cost me 1875.00 but I have an extended warranty and only have to pay for the deductible. I do most of the service work on my truck as I cannot afford to take it to the shop.
I have 90k miles on the truck and it runs great. It appears that this is a common problem with our trucks and if you have not or do not service the rear diff you may not know that this problem exist. I change out my diff fluid every 30k miles.
Just something to think about. My truck will be ready sometime on Wednesday.
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Old 05-11-2010, 09:19 AM
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Unhappy Rear starting to whine...

Speaking of rear diffs in the 4.7 trucks, mine just started whining a little bit. I think it was the quick lube place that assured me they had everything they needed to change the fluid in my rear diff. However, a few months later here I am with a whine in the rear end. I don't believe they had the additive like they said.

Have since put in the additive and double checked the fluid. All levels are good, but noise persists. Next step is to drain the diff, clean and put in correct fluid and additive. If that doesn't do it...well I don't want to talk about after seeing the price that you listed above.

Does anyone else have any other ideas or things I can look into?
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Old 05-11-2010, 09:56 AM
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If you have a whine and the oil level is correct, chances are that you have a bearing that's bad. Lack of the LSD additive would not have caused this problem. If you have the bearings replaced before any ring and pinion damage can occur, it shouldn't cost as much.
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Old 05-11-2010, 10:02 AM
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Randy thanks for the info...I will check into that ASAP!
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Old 04-20-2011, 02:12 PM
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Quote:
Originally Posted by RamTech View Post
If you have a whine and the oil level is correct, chances are that you have a bearing that's bad. Lack of the LSD additive would not have caused this problem. If you have the bearings replaced before any ring and pinion damage can occur, it shouldn't cost as much.
Havent pulled diff cover but mine is whining also!!! Which bearing do you think is bad, axle or diff bearings??
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Old 04-29-2011, 06:17 PM
brRam brRam is offline
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Quote:
Originally Posted by RamTech View Post
If you have a whine and the oil level is correct, chances are that you have a bearing that's bad. Lack of the LSD additive would not have caused this problem. If you have the bearings replaced before any ring and pinion damage can occur, it shouldn't cost as much.
depending on the bearing its not that difficult to change, if you are the slightest bit mechanically inclined (and have a good service manual I.E. Haynes). I have rebuilt a one ton rear end. the hardest part was getting the broken bolts out the axle cover.
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Old 04-29-2011, 06:27 PM
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I also had to replace the pinion bearing in my last Dodge (2001 2500hd) the bearing was about $75 with seals and the sort....It was a fairly easy job to replace.
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Old 04-30-2011, 08:50 PM
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Originally Posted by Ctmrxmas View Post
I also had to replace the pinion bearing in my last Dodge (2001 2500hd) the bearing was about $75 with seals and the sort....It was a fairly easy job to replace.
Dont you have to re-check pinion depth to ring gear after replacing bearings and collapsable/crush sleeves and back lash?? Im rebuilding mine but Im replacing my 3.92 posi with an open rear 3.55 spare axle till I have time to rebuild my original. Gonna try the 3.55 to see how much it will help on fuel economy! You have to buy quite a few specialty tools just to do the rebuild according to the shop manual! Is the '01 axle different from my '03?? thanks!
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