kpanza

So, just an update...got my truck back, but it's now leaking from transmission AGAIN...but while under the truck this weekend, I checked the rear u-bolt nuts...when I went to set them to 60 ftlbs, I had to crank on them almost a 1/2 turn! They were really loose! I backed them off, then back to 60, and then another 1/3 turn. Wow, They might have been 40-45 ftlbs from the factory?? Scary...

One positive note - after our monsoon-like rain this week in So Cal, at least my window isn't leaking!

So, the truck was at the dealer for 2 weeks, and they said they got the parts and fixed it. Drove it home and it sat for a few days, until I drove it to get some groceries and firewood last Saturday. Go to move it Sunday again, and what do I see? Yep, a big red puddle of transmission fluid on the driveway AGAIN. Words fail me. They either didn't actually fix it, or the tech is a dumbass, or the transmission has some sealing defect. Unbelievable. Goes back in again Tuesday, can't wait to hear what they say now. If it sits there another two weeks, will be time for lemon law. I've owned about a dozen GMs in my life, this is looking to be the worst of them...crazy. I love the truck, but this sucks.

Add me to the list...seems to happen the most (or at least I can hear/feel it the most) when in reverse, or very slow speeds...happens every time I back out of the driveway, for instance. My truck has been sitting at the dealership for a week and a half because of leaking tranny, but I will see if they can try the above procedure with the u-bolt torque attempt. First thing I thought of was the spare tire bouncing around (like above poster said), not that. I even checked to make sure I hadn't left something in the bed...sounds/feels like something is moving around, definitely from rear of truck. I only had the truck for 2 weeks before the tranny started leaking, but this noise/clunk was apparent right away. Anyone happen to know the appropriate torque setting offhand? My 5/8" u-bolts on my K5 axles are 140-150ft lbs...I know these will be metric bolts, but probably similar? I'll try it myself if they won't do it.

So, lucky me. My 2 week old truck is having it's transmission removed from truck, dealer tech says the torque converter seal is cause of the leak. When I saw the fluid dripping down from the bellhousing area last week, I thought there was no way it could be the torque converter already! The dealer thinks it was bad from factory, and should have been caught during the PDI, was probably leaking already. Wow, I am finding it hard to believe...2 week old truck, 300 miles on it...I've had a lot of GMs, but my faith is definitely waning. Really hoping that this is the last issue that pops up, but reality says it won't be. Anyways, let's see if this gets resolved remotely quickly...dealer has "No ETA at all on when this will be fixed"...great.

No one else had this issue? Truck is at the stealership now, I will post up what they find. Service advisor seemed pretty used to this complaint, said they even have an aftermarket silicone sealant that works better than the factory stuff on the plastic pans...we will see.

Hello All, New 2020 Sierra SLT owner here (longtime GM customer). Just got the truck (6.2L, 10spd, 4x4 Crewcab, max tow) last week. 300 miles on it. Loving it, so much better ride and smoothness than my '10 Silverado or '13 F150, both also Max Tow setups just like this. Anyways, I helped a friend get a 2020 Sierra SLE back in September, and about a month after he got it, he was at my house with it...I noticed tranny fluid on my driveway when he went to leave...got underneath and could see tranny fluid all over. I also saw engine oil (he has the 2.7L turbo 4 and the 8spd). His truck was at the dealer for 3 weeks as they had to wait for both an engine oil pan and tranny pan! So, when I saw the dreaded tranny fluid puddle on my driveway this weekend, I couldn't believe it! Brand new truck, 300 miles on it. Crawled underneath, trans fluid dripping. Appears to be at bellhousing area, above the pan? But I know it can fly all over. I assume it has been leaking since the day I got it last week, but this was the first time I backed into the driveway, and wherever it was collecting, the angle of the driveway made it drain onto the concrete. Not bashing on GM here, had plenty of problems even with my wife's Lexus, but is this a known issue? I searched and see a LOT of Ford forum guys complaining about the one time use plastic pans leaking, and obviously it's all shared between GM and Ford on this 10 speed. My friend's truck has the 8 speed. Who knows. Just hoping that it doesn't take weeks to get a pan if that is the problem? Thanks for any input if you have experienced this! Going to dealer tomorrow with it. Any other TSBs on this? I saw one for the SUVs with the 10 speed about the cooler line retaining bolt leaking?