duckcommander

There are no recalls for my truck. When I was first checking the vacuum I also looked at the brake pressure and it was 2500 to 3000 psi the first couple of pumps. I have not been able to it to that level again and it never goes above 1500 on a very hard stop.

My 2018 GMC Sierra doesn’t stop as good I think it should. My 15 Silverado stoped better. I’ve tried better pads didn’t help. I installed power stop kit on all 4 corners and no improvement. I had it to the dealership they just blew me off. I’ve checked the vacuum pump output lowest it falls in 9 inches of vacuum. My next thing is do any of the techs on here know what the brake psi output is supposed to be.

Truck was built 8-18. I had it to the dealership twice for trans and an alignment and for free oil change an trans. Nothing on the paperwork about any updates but it still could have been done. It doesn’t feel like a drivetrain vibration problem.

Is this the trans shudder? At 55 to 60 mph feels like it will vibrate 4 or 5 times every 15 or 20 seconds and the tach will move up and down 100 to 200 rpm every 5 to 7 seconds. I have a 18 6.2 8spd 7500 miles. I only drive 3 miles to and from work so it barley has time to get warm. Well yesterday day I drove 60 miles to go fishing and this started on the way home. I have had the 1 2 shift flare and it’s been slow to downshift back to 1st when coming to a stop sign for a while. I’ve taken it to the dealership twice for those problems but the say everything is in spec( big surprise ). I have not called the dealership yet but last time they were 6 weeks behind on transmission checks. I need drive it long enough to hit and get a video of the tach moving if it will do it again.

2018 gmc1500 17x8.5 0 offset. 285/70/17P falken wildpeaks. 1.5 motofab leveling kit 2 zip ties no rubbing

Ok thanks. I’ve done a little bit of trans work but nothing on the new stuff mostly glides and turbos. I very seldom get in v4 I have a short drive to and from work and I have a heavy foot. When on the highway I’m usually pulling a boat. On the paperwork it said Technician notes that transmission is one of the smoothest he has seen and it works perfectly. Service writer said we would just have to wait till it tears up before they can do anything. I said that’s easy for you to say your not the one that’s got to pay for an out of warranty trans repair.

I took my 18 gmc 6.2 8spd with 5000miles back to the dealership today for transmission problems flair-shift,delayed-engagement and not downshifting at stop signs. They couldn’t find any problems ( big surprise). My truck was driven a total of 2.8 miles! How can you check for transmission problems in that short of a drive? They only looked at the truck after I arrived the dealership 8 hrs later when I got in the truck to leave the trans temp was on 137 degrees! So GM techs can you diagnose transmission problems on 2.8 mile trip with the transmission not up to operating temperature?

Thanks

2015 Silverado 5.3 6 spd ran 195 all the time. 2018 6.2 8 spd runs 175 all the time.

I would like that tsb please

had a red Silverado now a red gmc

400 mile trip home on my new 18 cc4x4 stock 6.2 8sp 25.9 mpg

My SLT has all that but the 360 camera. Crew cab premium plus package

31.7 tall