The 6-peed transmission in the 2009 Sierra “stutters” or “slips” when shifting gears at low rmp. Neither the dealer nor a reputable local transmission shop can identify the problem with any certainty and it seems to be getting worse. It is most evident when the transmission temperature gets above 150 degrees.
I bought this truck a week ago with no warranty and am extremely concerned the transmission may take a dump on me in the near future.
Appreciate any info anyone may give with regard to this issue.
Thanks,
Bill