Krusty wrote:
Sounds like it could also be a driveline shudder. Some trucks are more prone to it than others, depending on driveline type, wheelbase etc. They are fine at normal ride height until a load is applied and it changes the u-joint angles enough to create a shudder felt on accel from a stop.
I had a similar issue but with a Ford, actually a couple of Fords (all LB CC DRW) It was finally determined to be just that driveline shudder / driveline wrap, most likely due to the carrier bearing being "soft" and allowing the driveline to whip around, as CC, LB has a long driveline.
Were all your trucks the same? CC/LB..ETC?
Do you know any Ford or Dodge owners? Perhaps a test tow with a non GM is in order.
