The flush done with the new fluid and it helped tremendously both the shudder my truck eventually developed as well as the horrible clunky downshifting. Hard downshifts not gone but much better.
Through consistently filling out the emails sent to me by GMC to rate the dealer( sent very delineated emails responses to surveys about how pissed off I was after 5 dealership visits and no fix) after work was performed I was contacted by a regional guy from GMC who offered me 3 options to try and help:
1. Have field engineer come out an drive my truck(since flush fixed MOST of the problem elected not to do this)
2. $4500 cash towards the purchase of any new GMC vehicle, I would have to negiote the price with the dealership, then they would apply the $4500 to the deal( don't really trust another new GMC vehicle, so didn't do this)
3. extend my transmission, transfer case and trans axle warranties and all related items another 5 years/75,000 miles from the trucks current milage. ended up with a warranty on those items good til 01/03/2025 or 118,335. Was best option for me since I drive my truck about 15-18K a year.
I would say to anyone having transmission problems be sure and always answer dealership surveys if you receive one. Only time will tell if my transmission starts all the bad clunky cramp and shudder again.
Hope this helps someone
