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About dkjbama

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  1. Sounds about right for e-rated tires and 3.73 gears. The gears will kill your hwy mpg. My old 2008 GMT900 with a 4 speed and 3.73 gears never did better than 18 on the highway and that was with a tune and 93 octane fuel on P rated Michelins. I towed my 3k lb boat/trailer combo 400 miles over labor day weekend and i think the computer said 13.5 when i got back home, which means somewhere between 11 and 12.
  2. 2018 5.3 8-Speed 3.42 87 Octane If I hand calculate it, it almost always comes out about 2mpg less than the computer. My 87 mile commute north to Tennessee every weekend has a lot to do with this. Google maps shows that trip almost always comes out to an average speed of about 50 mph. I normally get 22 to 23 on the interstate with the cruise set at 72mph. Around town, in my small city with lots of red lights and a heavy foot, I get between 11 and 13mpg.
  3. Well, I'll see you on the other side.
  4. This... possibly. The viscous coupling in an engine driven fan typically fails in the locked up position. With the truck in park and warmed up, rev the engine and listen for a howling noise from the fan.
  5. The OE AcDelco wires lasted you 8 years. I think (actually, I KNOW) ACDelco is what i would replace them with. Monkying around with aftermarket plugs and wires on these trucks seldom ends well.
  6. Weathertech floor liners and a toolbox. Not much need for pictures here.
  7. Likely looking for help on the $50k retainer that Dewey Cheatham & Howe asked him for.
  8. With that much salt, you need to be lubing the sliders and pins on the calipers every spring. Its pretty plain to see what happened. The pad backers corroded and stuck on the slider. causing the inside pad to wear prematurely. It's not uncommon on GMT900 and K2 trucks to go 100k miles on a set of OE pads/rotors.
  9. Young and dumb. Camera phones were a bit more primitive in 200404
  10. See Pg 17. https://www.gmc.com/content/dam/gmc/na/us/english/index/about/trailering-towing/02-pdfs/GMTB18CT100-2018-gmc-trailering-guide.PDF Best reference I could come up with on short notice. I can assure you, my window sticker says 3.42. EDIT: Looks like the 6.2 8-speed non-NHT trucks only came with the 3.23, but the 5.3 were available with 3.08 or 3.42
  11. Congrats. I own its fraternal twin. SLT PP 5.3, 8Spd, 3.42 in red quartz tintcoat. Only difference is the wheels. Bought last April for $13k off the $57k sticker. Love the truck unconditionally.
  12. Lose the E rated big tires and back off the hammer to 75 or lower and it might be worth it. Otherwise, likely not worth it. You certainly won't save enough on fuel to make up the price difference. Not really concerned about the topper, a tonneau cover can actually improve mileage over an open bed, so I can't imagine a topper will hurt you that much. It's the heavy, aggressive tires and high speed that will kill you. It costs money to go fast. On my truck, with factory P rated 32" tires, you take a big hit increasing cruising speed from 70 to 80.
  13. Can't speak to the K2; I haven't had to touch my brakes yet, but on my 2008, torque specs called for 100 ft-lbs on the caliper brackets and 50ft-lbs on the caliper mounting bolts.
  14. Of course we hear lot of complaints on the 8L90 transmission shuddering and banging. I'm just wondering how many out there have been problem free, since folks with problems seem to be the most vocal (rightfully so). My 9 month old 2018 5.3 SLT PP with 14,000 miles has been flawless except a little thud going from Reverse to Drive when the truck had less than 1,000 miles. How's yours?
  15. It's likely just the G80 locking up when you spin the tires. The thud you likely often hear is it locking or unlocking.
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