Information on Vibration Analysis and Diagnostic – 2014-2015 GM Trucks

[pokismoki]

On 3/26/2017 at 8:15 PM, Clarkie said:

The issue I was having was a vibration felt in the driver's seat and in the truck cab. It only happened in V4 mode at low RPMs. This would be from 1000 t0 1200 RPM. It started as an intermitant problem and slowly got worse. It always seemed to appear between 60 and 70 kph but would appear at lower speeds as well. The service techs that drove the truck felt it could be heard as much as felt inside the cab of the truck.

if it only happens in v4 then your tcm is not adding enough slip to the clutch to tune out the engine lugging under load. i zeroed out my tcc slip tables on v4 before, and whooa baby is that rough!