The fluid level can be checked and the unit is fully servicable, its just a PITA to do. Any 6L90 in a GM HD from 2021 thru 2023 has provisions for a trans dipstick. The parts are less than $50 from GM. Its a pretty straightforward mod.I'm going to have to look at my manual again for this truck. I want to say that it says the fluid level can be check, but that service is not necessary. Which to me means, the fluid is good until the part it is servicing fails, which is a bunch of crap.
If it says nothing about servicing, I'm going print the page you've attached and insert it in my manual as if it was an addendum from the manufacturer.
I see you watch good programs too, Snag!!!
It is ood they didn't put a dipstick in. My 2017 6L90E had one.
@64bawagon, You were going to preemptively replace the torque converter? That seems a bit extreme. With another OEM or something else?
Yes. Since the truck is/was used primarily for towing the 5th wheel, I was going to replace it with a Billet unit of better quality than the OEM. The 6L90 was a decent trans in my estimation but the Torque Converters GM uses are a weak link. Theres plenty of data on the 6L80 units around the 100K mark being wiped out due to the TC. I figured it would be cheaper to be proactive than have to replaced it on the road. Once the TC goes it wipes out the pump and the rest of the trans.
Precisely why I have rarely bought used over my lifetime. People who are happy with a vehicle and have no issues are less likely to sell.
Had a 21 3500 that we put 194k miles on towing a 40ft flatbed most times loaded with 10k lb of freight. We did 50k fluid changes and when we sold it she ran like new.
There is a lot of truth in that, but I think there are also more subtleties too. I'd never buy a used car/truck that is < 2 years old, as that is usually the point where lemons are given back or sold when guys are tired of dealing with constant problems etc.
It should not be. Before these idiots went to the dipstick-less BS, it was not an issue. There was nothing wrong with a dipstick, other than it costs them 5$, which they turn around and charge another 15$ not to have the stick. No reason for this to be an issue. We as consumers should not have to re learn how to check an AT fluid level, especially in trucks. I understand the disposable models, like the equinox or Traverse not having one, but the truck?
6500 from GM plus install.
WOW! We do new remans with 3yr warranty for about 3k for the trans plus install and programming...little over 4k.
YOU ARE CORRECT! Every 6 speed I have replaced had horrible pump whine and shudder...right around those miles too! I did not think about what you said until you said it.
