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Roaring noise while driving, not from front end

  
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Roaring noise while driving, not from front end

 
1999CUMMINS4X4 1999CUMMINS4X4
New User | Posts: 21 | Joined: 08/08
Posted: 01/20/13
01:44 PM

Hey guys, I have a 99 Cummins 4x4.  Noticed a very loud grinding/roaring noise while driving, was positive it was a wheel bearing.  It sounded like every other wheel bearing I have ever heard.  Jacked the front end up, sure enough, drivers front wheel hub assembly was shot.  Changed it, still have the roar while driving.

I changed the hub yesterday, this morning, I blocked the front wheels, jacked up the back, and brought the speedo up to about 40 mph.  The roar is still there.  Fluid level in transfer case is fine, as is the fluid in the rear diff.  U joints on driveshaft seem tight.  

The only thing I can see that may be a problem is when I grab a back tire when jacked up, and rotate back and forth, a loud clunk is heard from the shaft that runs from the driveshaft into the transfer case.  I know there is bearing in there that the snapring can go bad on, could this be it?

Any help would be greatly appreciated!  

White_Lightning White_Lightning
Guru | Posts: 941 | Joined: 07/09
Posted: 01/28/13
09:55 AM

Could be, grab the output shaft from the transfer case and see if you can wiggle it  
Logan
1995 12 valve Cummins 6.0L, 5 speed, 4x4, 600hp Valair Clutch. Air Dog 4GHD lift pump, no fuel plate, 2095 rack plug, 024 DV's, pump benched at 440cc, SDX 5x.014 injectors, Hamilton 181/210 cam and HD pushrods, Stage 2 Port job, 5 angle valve job, 60lb valve springs, ARP studs, O-ringed head, .020" over head gasket, coated pistons, balanced bottom end, Fluidampr, PDI exhaust manifold, homemade intake manifold, 63/68/0.80 over 80/92/1.32 compound turbos.

1999CUMMINS4X4 1999CUMMINS4X4
New User | Posts: 21 | Joined: 08/08
Posted: 02/01/13
03:30 PM

Thanks man  

1999CUMMINS4X4 1999CUMMINS4X4
New User | Posts: 21 | Joined: 08/08
Posted: 03/03/13
01:45 PM

Update

The roar is coming from transmission.  Only happens when I hit O/D.  Turn overdrive off, noise goes away almost completely.  Any body have any suggestions?  To be honest, out of all the work I have done to this truck, the tranny fluid is stock, has 105k miles on it.  I'm guessing the best place to start would be a fluid and filter change?  Re-torque the bands?