I have the M5U Tranny...
My AFM is turned off via my Blackbear ECU Flash. Blackbear does not do TCU tuning as the TCU is locked by GM. I'm taking it back in to see if there are any TCU SW updates and a re-learn. My mechanic there told me upfront that the Mobil1 HP Fluid swap was only short term solution
I had my fluid swapped out at 18K miles on my 2017 back in December and today (April 7th) at 22K miles the clunking and hard shifting is already back again.
Ok, mine is now swapped over to the new Mobil1 ATF, however the GM Tech told me that this is a temporary fix. He said eventually GM is going to have to replace all the Torque Converters in all these transmissions.
I'm only at 19K on my 17' Yukon Denali and have been experiencing some weird Transmission shifts and some noise while driving for the last month. I started noticing some weird rumble (like braille driving/rumbling) that I was attributing to pavement noise or tire/wheel out of balance but it’s happening now on roadway I’ve driven on prior that it has not happened on before. Vehicle is going in tomorrow for the TSB 18-NA-355 Fluid Swap Out https://gmauthority.com/blog/2019/08/tsb-seems-to-fix-8-speed-automatic-gm-transmission-problems/comment-page-6/
Geezz, mine is doing this now (rumble strips/braille driving) and it thought it was the road pavement. I'm a 17' with only 19K mileage.
I had problems with the D3S Morimoto bulbs (twice) in my 17' Yukon Denali. They would flicker because the OEM OSRAM ballast could not keep up with the required output/draw of the Morimoto's. Tried two sets of D3S Morimoto bulbs and finally pulled them and went with OSRAM Cool Blue Advanced 6000K Lows with Morimoto LED 6000K High Beams and Morimoto LED 5500K Fogs. They all perfectly match in color output
Most OnlineNewest Member
Who's Online 54 Members, 0 Anonymous, 1,651 Guests (See full list)
- Daniel Crespo
- Jeff Harrison
- BO TIE 1
- James Beyer