20L8TSierra24

42k on my 24. -Valve body @ 12k -Pump, stator, and some support at right around 18. Now, it's starting to whine like a 20 yr old air conditioners capacitor when coasting to a stop.

It appears that TSB only goes to MY 22. Does it apply to newer vehicles?

So what exactly is making the knocking noise? The cover, pushrod, or the cam striking the lifter as it comes around becauseits not expanding fully?. My dealer replaced all 16 of the lifters, and 2 pushrods on my 22 L87. This morning the noise wasn't as pronounced but it was like 90° already when we started it. It doesn't do this if the engine is warm at all either. It was more of a light tap.

So would I have an issue running say 5w-30 oil?

Same garbage lifters. I traded in a 22 L87 that had the lifters done twice 7800/33k for a 25 and before the new car smell wore off, the engine's knocking. Dealer already acknowledged, and told me to get in in for repair. Guess I expected this to be resolved on the 6th year of the DFM L84's... Guess not. https://youtu.be/i8Wj6THFNJo?feature=shared

After 3 fluid changes with absolutely no improvement, they ordered a complete rear end.

My vehicle doesn't qualify for lemon law or BBB claim due to its age unfortunately.

What's frustrating is both dealers are essentially saying this is a joke... I have 400 more miles to put on it before GM will even consider replacing it.

If it were out of warranty, this would be the route I'd try. However, GM has had me waste my time with 3 fluid changes and after a couple hundred more miles, it's no better as expected. The rear end feels like I have a truck in 4WD on the pavement while turning now.

I've had ongoing Trans issues as well. Valve body was done & now a complete unit has shipped. Should have my truck repaired within a couple weeks as well. Hopefully the "updated" Trans will last more than 20k miles.

I told my wife that her Yukon converter shudder developed because of the DFM. I wasn't aware that Range had this for the T1 SUV's now. I had one on a 14 silverado 5.3 w AFM. Thanks for sharing

GM customer service has been nothing short of a waste of my time. I filed a BBB claim on the vehicle today.

I've had it at 2 different dealerships. Victory Layne Chevrolet as well as Dixie GMC. Both dealerships have said they can only change the fluids 3 times per TSB unless the part physically fails. I'm worried my wife will get stranded on a busy road and potentially get in an accident when it does lock up. I filed a BBB auto claim this morning because it has reached the 3rd attempt without resolution threshold.

Going through the exact same thing right now. GM has a TSB and they've changed the fluid 3 times now in ours. The noise never goes away even with the fresh fluid now. It's actually worse now than it was before the fluid change

My 21 Yukon with 49k miles is getting a torque converter for a nasty shudder.