William Amtower

There is no issue. I have 32,000 on my 2019 Sierra Denali Ultimate with the 6.2 no issues. I haul heavy loads an occasionally tow 7500 pounds. The only issue was the defective valve spring issue from one of the suppliers. The supplier over hardened the a batch of springs and then failed to run the required quality control tests that would have caught the bad batch. The springs were so hard they snapped like a pretzel. I would be surprised if they are still in business after GM got done with them.

I don’t know if this applies to your setup. I have the GM High Performance option on my GMC Sierra 1500 with the 6.2. It required a reprogram of the ECU at the time of installation. The reprogram comes with the package. It adjusts the ECU for the increase in air intake.

A little over a year and mine started leaking also. Dealer said frame was warped, order replacement. Ordered on Monday, came in on Friday. Going in on Monday to have it installed.

Well add me to the leaking rear sliding window. Took it in to the dealer on Monday. He confirmed cracked frame on driver side corner of the frame. Ordered a replacement on Monday and it is supposed to arrive tomorrow. Service Advisor said bring truck in on Monday to have it installed. I will post an update on how it goes and the window part number installed.