RayMich
Well-Known Member
Good morning guys! I am having a problem that I hope the truck gurus here can help me solve.
I recently purchased a 2004 Silverado 2500HD 6.0L 4WD extended cab truck with 99,000 miles on the odometer, to replace our older 2002 plow truck that is finally worn out.
Sadly, I didn't notice a sever vibration between 52 to 72 mph, because of heavy rush-hour traffic when I test drove the truck at the time of purchase.
NOW THE PROBLEM: The truck has a very nasty vibration between 52 to 72 mph. It feels like you are driving over nasty rumble strips. The vibration is not there below 52 and gradually goes away above 72 mph in 2WD mode. I had my local tire shop dynamically balance all 4 wheels, but the vibration is still there just as bad. Additionally, my son noticed an oil leak coming from the area of the transfer case.
I took the truck to my repair shop the next day and they found a cracked T-Case Adapter, which I told them to replace. Picked up the truck the next day and while on the highway on the way home I noticed the bad vibration is still there at 52 to 72 mph. By this time, the repair shop was closed so I went home.
The next day, my son again noticed a T-Case leak.
I then took the truck back to the repair shop and they found the leak coming from the seal between the T- Case and the T-Case Adapter, which they fixed under their warranty. They also found the front drive shaft U-Joint at the T-Case was binding up, so I had them replace that as well. Picked up the truck the following evening and again noticed the bad vibration at highway speeds on the way home.
( QUESTION: Does the front driveshaft still turns when the truck is in 2WD mode? - I was under the impression that the front driveshaft is disconnected when the T-Case is in 2WD mode, as well as the actuator on the front axle disengages the differential. - This is the electric shift 2-speed t-case.)
Today I spoke with the repair shop owner and he said to drop off the truck when I get a chance (hopefully tonight) and he will remove the rear driveshaft and send it to a balance shop to be checked ( Should have an answer for me in a couple of days ). I asked him about the U-Joints on the rear driveshaft and he said they looked fine, but they did notice one of the clips on one of the u-joint was loose so they "re-installed it." He also said that he had not noticed any damage on either driveshaft and no missing balancing plugs.
It appears to me that this nasty vibration is what caused the T-Case adapter to break as well as the subsequent gasket leak after the adapter was replaced.
Any suggestions and comments are greatly appreciated.
Thanks.
I recently purchased a 2004 Silverado 2500HD 6.0L 4WD extended cab truck with 99,000 miles on the odometer, to replace our older 2002 plow truck that is finally worn out.
Sadly, I didn't notice a sever vibration between 52 to 72 mph, because of heavy rush-hour traffic when I test drove the truck at the time of purchase.
NOW THE PROBLEM: The truck has a very nasty vibration between 52 to 72 mph. It feels like you are driving over nasty rumble strips. The vibration is not there below 52 and gradually goes away above 72 mph in 2WD mode. I had my local tire shop dynamically balance all 4 wheels, but the vibration is still there just as bad. Additionally, my son noticed an oil leak coming from the area of the transfer case.
I took the truck to my repair shop the next day and they found a cracked T-Case Adapter, which I told them to replace. Picked up the truck the next day and while on the highway on the way home I noticed the bad vibration is still there at 52 to 72 mph. By this time, the repair shop was closed so I went home.
The next day, my son again noticed a T-Case leak.
I then took the truck back to the repair shop and they found the leak coming from the seal between the T- Case and the T-Case Adapter, which they fixed under their warranty. They also found the front drive shaft U-Joint at the T-Case was binding up, so I had them replace that as well. Picked up the truck the following evening and again noticed the bad vibration at highway speeds on the way home.
( QUESTION: Does the front driveshaft still turns when the truck is in 2WD mode? - I was under the impression that the front driveshaft is disconnected when the T-Case is in 2WD mode, as well as the actuator on the front axle disengages the differential. - This is the electric shift 2-speed t-case.)
Today I spoke with the repair shop owner and he said to drop off the truck when I get a chance (hopefully tonight) and he will remove the rear driveshaft and send it to a balance shop to be checked ( Should have an answer for me in a couple of days ). I asked him about the U-Joints on the rear driveshaft and he said they looked fine, but they did notice one of the clips on one of the u-joint was loose so they "re-installed it." He also said that he had not noticed any damage on either driveshaft and no missing balancing plugs.
It appears to me that this nasty vibration is what caused the T-Case adapter to break as well as the subsequent gasket leak after the adapter was replaced.
Any suggestions and comments are greatly appreciated.
Thanks.