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  1. Lifted L5P

    Front Differential Gear Whine on Deceleration - Yukon 4.56

    Appreciate the response. The front driveshaft spins freely in 2wd with the transmission in park laying under the truck in my garage. When placed in 4wd you can hear the range fork actuate, and when engaged I can no longer spin the front driveshaft. Unfortunately AAM has decided to no longer...
  2. Lifted L5P

    Front Differential Gear Whine on Deceleration - Yukon 4.56

    Appreciate the response. Not sure on the axle shaft or the hub. One would not think so on a truck with only 38k miles, especially since it was totally quiet with the stock 3.73’s, but stranger things have happened like the transfer case vibration caused by an internal sprocket misalignment...
  3. Lifted L5P

    Front Differential Gear Whine on Deceleration - Yukon 4.56

    The 4wd is operating correctly ... verified proper operation earlier this week when only the back tires spun on the wet salt flats in 2wd ... and in 4wd could feel the front axle / transfer case engaged ... plus I could distinctly hear the normal light hum of the transfer case. I know ... this...
  4. Lifted L5P

    Front Differential Gear Whine on Deceleration - Yukon 4.56

    Unfortunately we were so busy analyzing the wear pattern that I wasn’t smart enough to remember the pictures ... but I am pulling the differential covers again later this week and will be sure to take lots of pictures ... need them to get my replacement gears from Yukon. I can however tell you...
  5. Lifted L5P

    Front Differential Gear Whine on Deceleration - Yukon 4.56

    Greetings everyone. Have a 2019 CC SB 4x4 Duramax with a 4-inch differential drop lift kit and 35 inch tires (305/70R18). Changed out the stock American Axle Manufacturing (AAM) 3.73 axle ratio ring & pinions to Yukon 4.56’s to properly turn my 35’s and get my towing performance back. Also...
  6. Lifted L5P

    idle above 800 ... a pain in traffic

    Probably in regen ... my 2019 L5P increases the idle 300 rpm when in regen.
  7. Lifted L5P

    Bad Transfer Case - Since New - 2019 Chevrolet 3500HD SRW SB

    They said it was caused by the lift kit. I asked ”How is that possible when I provided the lift kit purchase & install receipt with the date showing it was installed after the multiple times I brought it in complaining about the transfer case.” They replied “It doesn’t matter, we have made our...
  8. Lifted L5P

    Bad Transfer Case - Since New - 2019 Chevrolet 3500HD SRW SB

    Service writer took it to the Warranty District Manager for Gm who denied it. That was verified when I called Chevrolet Customer Service ... they had it on record.
  9. Lifted L5P

    Bad Transfer Case - Since New - 2019 Chevrolet 3500HD SRW SB

    The dealer never would admit there was any issue with the transfer case. I would take the service advisor for a ride, put the truck in 4WD, press on the accelerator (straight road, relatively slow speeds), the truck would vibrate, and the service advisor would say that’s normal. So we would go...
  10. Lifted L5P

    Bad Transfer Case - Since New - 2019 Chevrolet 3500HD SRW SB

    I did not lift my truck until 25k miles (per the sales receipt). The truck has exhibited this issue since the first time it was put in 4WD with under 1k miles. I have three Chevy dealer warranty inspection invoices to prove it ... one at 1.5k miles, another at 13k miles, and another at 22k...
  11. Lifted L5P

    Uneven Tire Pressures and Part Time 4WD Transfer Case ?

    When the accelerator is depressed in 2wd and you hit an ice patch (incline / flat terrain ... don’t matter) ... and the rear tire loses traction ... the rear locker kicks in ... and the rear end kicks sideways in a heart beat. Rear end kicking out sideways at highway speed is a bad thing. Seen...
  12. Lifted L5P

    Uneven Tire Pressures and Part Time 4WD Transfer Case ?

    I wish there was an easy retrofit to the new transfer case with auto 4x4 (built-in clutch). Spend a lot of time on the highway in winter in the western US with intermittent ice patches ... would be nice to have the 4x4 option for those situations. Should have purchased a 2020 instead of my...
  13. Lifted L5P

    Uneven Tire Pressures and Part Time 4WD Transfer Case ?

    Got a question for ya’ll ... and hopefully this is the right forum for this question. I know GM puts 60 psi front and 80 psi rear on the door sticker for heavy payload / towing considerations ... and possibly rear end stability as well. However, we all know this causes the front tires to sag...
  14. Lifted L5P

    New to Forum

    Thanks for the welcome response. Technical question since your signature says transmission service ... Our trucks state 60 psi front & 80 psi rear regarding tire pressures on the door sticker. With less pressure in the front tires, and the heavier engine over the front tires, the front tires...
  15. Lifted L5P

    Bad Transfer Case - Since New - 2019 Chevrolet 3500HD SRW SB

    Got tired of arguing with multiple local Chevy dealers that there was something wrong with my transfer case since day 1 (purchased truck new September 2018). When in 4WD and pressing down on the accelerator ... the truck had a significant vibration that I did not feel in my father’s identical...
  16. Lifted L5P

    New to Forum

    Thanks
  17. Lifted L5P

    New to Forum

    Thanks ... many late nights in my garage over the last two years installing aftermarket accessories ... but it’ s been worth it ... drives and tows really well now ... plus it now sits at the same height next to an F350 ... never liked being looked down upon by a Ford 😉.
  18. Lifted L5P

    New to Forum

    Thanks ... many late nights in my garage over the last two years installing aftermarket accessories ... but it’ s been worth it ... drives and tows really well now ... plus it now sits at the same height next to an F350 ... never liked being looked down upon by a Ford 😉.
  19. Lifted L5P

    New to Forum

    Thanks for the addition to the forum.