Finally. I've been waiting for this. Never had it disabled since I may have opened the rear window once. I'll take a defrosting window over a sliding window any day.
From what I've seen it looks like the ones that blow up are crew cab 4wd short box models. Most likely not with 3.08 rear ends. The higher the rear end ratio, the lower the max speed. The drive shafts in those trucks are aluminum, 4" diameter, .083" thick, and 70" long. They have a critical speed of ~4000rpm. So with 31.5" tires (265/65/18) and a 3.42 rear end, you end up with a top speed of approximately 110mph before it'll break. A 3.08 rear end ups that to 122mph and a 3.73 goes down to 100mph. Looks like a rwd crew cab standard box is the only model that comes with a 2 piece
From the specs I found on the driveshaft, yours would reach critical speed at 5146rpm. In fourth gear that'd put the engine rpm at 5917 and truck speed of 157mph. In fifth gear it'd reach that speed at an engine rpm of 4374rpm. I doubt the truck has the power to gain another 20mph. I don't think I'd worry about your drive shaft.
My guess is shocks if nothing else changed. I run 40 to 45 psi in tires that are max 80psi. Two reasons for it coinciding with change in tires: The winter tires were a lower pressure and affected the way the truck hit the bumps. Or the road thawed out and the bumps changed. I changed out my ranchos for bilsteins and never worried about the rear end jumping around again.
7000 miles and I've never seen my '18 6.2 Max Tow trans go over 150F. I tow diddly squat. Ambient temps have been low but I can't imagine it'll go over 170 without towing something up a hill. My '14 6 speed was always at 190+F. The '18 warms up way quicker too. Bought it as a Demo so he might have modified it or GM changed the design. If there's a way to run the trans cooler and warm up quicker it's worth every penny. Your transmission and wallet will thank you later.
It's evident that you can't be experienced in driving a variety of trucks in a variety of off road conditions. Every truck, will react differently on a surface due to a number of factors. Those include but aren't limited to: the surface itself, tires, suspension, wheelbase, and weight. Now considering you have a z71 suspension, it's relatively stiff compared to other models. Every truck will do what you experienced under the right conditions. My 2014 z71 our main highway would rattle your brains out due to its lack of dampening. The pavement wasn't broken but heaved due to frost and freeze tha
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