Transfer case issues on 18 2500?

[akbob]

I was driving across Idaho towing 10k when I hit a bump in the highway and a grinding noise started. I pulled over, got out and checked to see if I was dragging something or if there was obvious damage. Everything looked fine so I got back in, put it in gear and started driving and immediately the grinding noise started again so, I pulled back over and turned the truck off.

I was a long way from no where, so I decide to see if I could limp close enough to at least call for a tow. I restarted the truck and started to merge back onto the highway but the noise was gone!? Bumpy highway and it wasn't long before the exact same thing occurred. Every time I hit a hard bump I would have to pull over, shut the truck off, wait five minutes, restart and continue on.

Once the road conditions bettered I did not experience this anymore, but the speed limit dropped when exiting the state too so that may have a part in this also.

Any one else experience this or have a clue as to what is happening. I know if I take it to the dealer here it will just sit for a week and then they will say they couldn't reproduce it.

 

[MtnRider]

Could you "feel" the noise or just hear it? I would think if it was driveline releated you would feel it (could be wrong though). Sure it wasn't something like a loose fan shroud hitting the fan or something?

Just spitballing here.

.

 

[akbob]

Couldn't feel it. the noise slowed with a reduction in speed and stopped whilst parked with the engine running. Sounded like a I was dragging a a heavy metal object. The grinding would continue if the truck was moving or, until the truck was shut off and sat for a few minutes. Like the transfer case was resetting? Fan shroud is solid.

 

[Ozymandias]

Take it to the dealer, I guess you are still under warranty.
If the fault is so easy to reproduce there should be no discussion.

 

[akbob]

Take it to the dealer, I guess you are still under warranty.
If the fault is so easy to reproduce there should be no discussion.

Not easy to reproduce on smooth highways here, only happened at 80 mph after hitting highway bumps in another state whilst towing 10k and speed limit here is much lower- already stated or implied as such, however I should have used proper punctuation after this question so as not to confuse you:

"Any one else experience this or have a clue as to what is happening."

 

[Newsa]

Have you been lubing your front drive shaft?

 

[Newsa]

Have you been lubing your front drive shaft?

Never mind, you have the CAD

 

[Bob4x4]

Take it to the dealer,more than likely there will be a stored code in the DTCM.They May or may not find the problem in a timely manner.Im sure you don’t want to be in the middle of nowhere and have your t/case explode.

 

[AH64ID]

Manual or electric transfer case?

 

[akbob]

Take it to the dealer,more than likely there will be a stored code in the DTCM.They May or may not find the problem in a timely manner.Im sure you don’t want to be in the middle of nowhere and have your t/case explode.

Sorry, already replied to your other account Ozymandias

 

[akbob]

Manual or electric transfer case?

Electric

 

[AH64ID]

I agree on taking it in, but you could wiggle the actuator and see if it's loose.

 

[Ozymandias]

Sorry, already replied to your other account Ozymandias

???