| Is there an allison dealer close to you? I would talk to them and see if it is normal. I am willing to bet that what you are hearing is the allison whine or the torque converter lock up. If there isn't an allison dealer close by I would take it back to the dealer and have them look at it. It sucks trying to diagnose a problem over the internet.
__________________ 2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
285/75-16 BFG T/A KOs, Eagle Alloys Series 187
Clifford 2 way remote start, High Idle, Bilstein 5100s, 1.5" lift blocks
AFE Magnum Force Stage 2 Proguard 7 intake
Racor 2 Micron pre-OEM with heater & water sep. Waiting install:Rancho Steering stabilizer....all thanks to NorCal Truck  Support your Supporting Vendors | 
Linear Mode
