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Old 11-28-2005, 12:36 PM   #1
rjd
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The rear differential on my '03 GMC 3500 D/A was just rebuilt with only 27K mi. (+/-50% of the mi. occured while towing a 12000lb 5th wheel). There was too much play, resulting in the differential producing too much noise and heat. I was told this is not common. Anyone else expereince any problems with the rear differential on a dually or other HD truck?
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Old 11-28-2005, 12:36 PM   #2
rjd
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The rear differential on my '03 GMC 3500 D/A was just rebuilt with only 27K mi. (+/-50% of the mi. occured while towing a 12000lb 5th wheel). There was too much play, resulting in the differential producing too much noise and heat. I was told this is not common. Anyone else expereince any problems with the rear differential on a dually or other HD truck?
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Old 11-28-2005, 03:47 PM   #3
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Hi rjd,

Sorry to hear about the problem with the rear differential on your GMC 3500, I have a similar truck on order and was surprised at your problem.

There's a forum that specifically discusses GM Duallies, click the link if you're interested.
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Old 11-28-2005, 08:15 PM   #4
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That is a good place to learn about such problems. I seem to remember reading there about diff problems. It requires a mechanic with knowledge, and interest in doing a good job to setup a diff correctly. Nearly all of the mechanics around me direct diff work to one specific shop that specializes in this; usually for race cars.
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Old 11-29-2005, 04:35 PM   #5
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Sorry to hear about your rear diff. That is the first I have heard of with the 01 and newer 3500's. My 01 han now problems with the diff in the 127,000 miles I put on it. Now a local excavator is using it to pull severly overloaded, a 19,000 pound front end loader/ back hoe not counting the trailer. Truck now has over 150,000 miles on it.
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Old 12-01-2005, 09:30 AM   #6
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Thanks everyone.
I hope it was done right and I won't expect any problems for the next 125,000 miles ;-)
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Old 12-01-2005, 10:46 AM   #7
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The GM truck comes with 70-90 weight synthetic oil and if you are pulling heavy you need to go to the optional 70-140 heavy duty oil or you can heat up the differental. Mine got hot enough to burn the paint off it before I changed it but no trouble after that. I would highly recommend using the heavy duty oil.
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Old 12-03-2005, 04:14 PM   #8
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I did forget to mention my 01 Duramax rear diff was a half quart low from the factory. My 05 was filled corectly from the factory. On both trucks after 5000 miles I changed the diff oil, you would be surprized how bad it get while the gears are setting.
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Old 12-08-2005, 04:03 AM   #9
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145,000 mi on my g70 locker...no problems.
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