Drive shaft/rear diff clang? - Dodge Cummins Diesel Forum
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post #1 of 14 (permalink) Old 09-15-2019, 08:26 PM Thread Starter
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Drive shaft/rear diff clang?

Guys, was wondering if I could get some ideas on this issue. I plan on making an appointment with dealer to have this looked at but want to go into the appointment with as much knowledge as possible. I get a drive shaft clang or rear diff clang when I am driving at slower speeds (at least this is when I hear it the loudest). It happens when I am coasting, then push the accelerator (slow moving stop and go traffic) and it clunks/clangs as power is applied. (Not hammering down the accelerator either). Sometimes I hear it when I let off the accelerator too, but not regularly. My rear pinion seal has gone out and been repaired....not sure if that is related to this or not but thought I would throw it in here just in case. Any help would be appreciated. Approx. 16,500 miles on 2500 mega.


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post #2 of 14 (permalink) Old 09-15-2019, 08:31 PM
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How loud is it? The is some slop in the drivetrain. Gear mesh in the transfer case and rear end. It's not much but enough to make a bit of a thud when you roll off and back into the throttle quickly. Should hear my truck do any type of emergency stop at slow speed. Slam the clutch down when under power, youd think something was coming apart.

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post #3 of 14 (permalink) Old 09-15-2019, 08:36 PM Thread Starter
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How loud is it? The is some slop in the drivetrain. Gear mesh in the transfer case and rear end. It's not much but enough to make a bit of a thud when you roll off and back into the throttle quickly. Should hear my truck do any type of emergency stop at slow speed. Slam the clutch down when under power, youd think something was coming apart.
Ok, that is good to know. For me its loud enough to hear with the windows up and radio playing....plus my hearing isn't that great. Thanks for the reply.

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post #4 of 14 (permalink) Old 09-15-2019, 08:38 PM
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Knowing that you had the pinion seal replaced, I would take it back to the dealer. If nothing else make sure its documented. Could be they didnt get it back together correctly.
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post #5 of 14 (permalink) Old 09-15-2019, 10:30 PM
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Could be they didnt get it back together correctly.
Could be???
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post #6 of 14 (permalink) Old 09-15-2019, 10:41 PM
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I was trying to be optimistic for the OP. It's more likely they did not than did.
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post #7 of 14 (permalink) Old 09-15-2019, 10:52 PM Thread Starter
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I was trying to be optimistic for the OP. It's more likely they did not than did.
I am not noticing any further leaking from the pinion seal area, I have been checking that area frequently....just in case.

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post #8 of 14 (permalink) Old 09-16-2019, 12:12 AM
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Check your U-joints.

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post #9 of 14 (permalink) Old 09-16-2019, 12:23 AM
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Rear control arms nice and tight? No loose rear shocks?

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post #10 of 14 (permalink) Old 09-16-2019, 02:24 AM
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There is no play in the TC to cause such a thing. Probably u-joints, Carrier bearing or differential. Seeing as how you had a bad Pinion seal, maybe the bearings are bad too. Any which way you look at it, it should be a warranty issue.

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post #11 of 14 (permalink) Old 09-16-2019, 10:44 AM
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Any which way you look at it, it should be a warranty issue.
Or, pull the cover and look for any damage, and check the backlash.
That way a dealer can't just say "Oh, that's normal" if it turns out to be loose bearings or .018" backlash.
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post #12 of 14 (permalink) Old 09-16-2019, 11:58 AM
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When your rear pinion seal is replaced you have to first remove the 4 bolts holding the yoke to the flange.



Then you have to remove the flange nut and washer and the flange at that point will come off.



Then you can remove old seal and hammer in the new one.

What probably happened is when they went to tighten the flange nut back on there with an air impact they probably made it tighter than it should be, which as previously mentioned most likely changed the factory backlash and pinion preload. Or they didn’t tighten it enough.

They need to measure backlash and pinion preload to make sure it falls in line with factory specs.


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