I'm joining this thread... same issue here.
I bet this issue affects 100% of all Silverado half tons with the same 6 speed trans.
Has anyone ever had this fixed with the firmware flash or should I just live with it until I'm ready to get the black bear tuner.
Also, I'm new to tuners. Is there a downloadable setting adjustment that can match the others who had success?
And... the downshift clunk. Will the black bear fix this as well?
Last, can I just revert this back or will my powertran warranty basically be gone?
I plan on keeping this truck long term, it fits all my needs and overall I like it... but these two issues do impact my opinion of the truck.
summary -- Want to get rid of chuggle and downshift clunk.
