Hey Guys,
I have been chasing a vibration with no success that appeared out of no where in my 08 Tahoe LTZ and am coming to more intelligent minds than my own for suggestions/input.
Vehicle Details: 2008 Tahoe LTZ 4x4 with 165k miles (no lights on dash and no codes returned when scanned)
Symptoms:
- Vibration on both acceleration/deceleration (which prior to the first dealership visit was most noticeable above 77mph; it was observed at lower speeds as well ~40/45mph but at 77mph a passenger would identify that there was a vibration)
- Vibration is still present when putting the transmission into neutral at speed.
- Vibration is most noticeable on acceleration (for example; accelerate to 60, let off the gas, and the vibration is less on deceleration than it is upon acceleration).
I took it to the a local Chevrolet dealership for diagnosis and had their suggested work completed on it but the issue seemly is worse/more noticeable at lower speed than it was when I first took it in.
During this first visit to the dealership they:
- Replaced both Front Hub Bearings (technician noted that they were noisy and that the RF had play)
- Replaced A/C Belt (cracked)
- Total A/T Fluid Exchange
- Replaced Front Differential Pinion Seal
- Front Differential Service
- Front Differential Kit Service Synthetic
- Transfer Case Fluid Exchange
- Power Steering Kit Service
After that visit and noticing that the issue still existed, we took the service manager along for a drive on the highway and exhibited the same behavior as noted above. During this trip, it was observed that when power braking the truck that at least one of the engine mounts had failed.
During the second visit they:
- Replaced Both Engine Mounts
- Replaced Exhaust Manifold Gaskets and Bolts
- Replaced Exhaust Seals (2)
- Road Force Balanced All 4 Tires
Obviously a little defeated, I took it home after the second visit and wanted to rule out a tire issue (I believe this could be ruled out as the vibration subsides on deceleration) so I rotated the tires but there was no change in the symptoms after this. I checked for missing weights on both front and rear driveshafts and did not find any indication of any missing.
The truck was 99.9% of the time operated with the 4x4 selector in Auto but since having this vibration was switched to 2HI (and has been since before the first visit) in an attempt to rule out any complications there but the issue still existed. If I change the dial into Auto, I can hear the some engagement below the vehicle and nothing sounds bound up in the transition or anything.
It goes without saying that I am nearing my wits end on chasing down after already sinking a substantial amount of money into the fix. This truck has been solid with very little minor issues and shows that GM knew how to crank out quality even after a recession.
The only bad idea is no idea so shoot any ideas that you might have.
Appreciate any and all knowledge and experience for you guys! Thanks in advance!
