[GroundhogSS]

Just started having the shudder again at 91K miles. I had the last flush done 02/18/2019 at 35,900 miles. I know the fluid changed in 2019 but don't know if it was before or after February. I may have the old stuff in there.

[Gunkk]

EDIT: The change kits went to dealers into March. Probably a mix of old and new. Moisture is what eats the friction modifiers, which leads to stick-slip clutch wear i.e. shudder. So do the triple flush and fingers crossed they do it right so they get your currently "wet" fluid out. Here is the Techlink that explains the timing of the 2019 changes: https://gm-techlink.com/?p=11127

So yeah, budgeting for a triple-flush service every 50k or so might be worthwhile.

EDIT2: Triple flush procedure. Interestingly also says Camaro was clean as of Feb 1, 2019. https://static.nhtsa.gov/odi/tsbs/20...63890-9999.pdf Hilariously the tech gets paid 1.1 hrs. No fcuking way you can do that procedure completely with a drive test in an hr and make a half-buck on the job. So bring donuts and red bulls on the day you drop off your car.

[GroundhogSS]

Thanks for the info. I'm right on the border on the date but the dealer may not have gotten their equipment and fluid at that time.
Oh well. Going in in a week to get it checked out. No way I'm going to let them work on the trans, only flush.

Originally Posted by Gunkk

EDIT: The change kits went to dealers into March. Probably a mix of old and new. Moisture is what eats the friction modifiers, which leads to stick-slip clutch wear i.e. shudder. So do the triple flush and fingers crossed they do it right so they get your currently "wet" fluid out. Here is the Techlink that explains the timing of the 2019 changes: https://gm-techlink.com/?p=11127

So yeah, budgeting for a triple-flush service every 50k or so might be worthwhile.

EDIT2: Triple flush procedure. Interestingly also says Camaro was clean as of Feb 1, 2019. https://static.nhtsa.gov/odi/tsbs/20...63890-9999.pdf Hilariously the tech gets paid 1.1 hrs. No fcuking way you can do that procedure completely with a drive test in an hr and make a half-buck on the job. So bring donuts and red bulls on the day you drop off your car.