Noise/feeling in pickup

[Munster4x4]

Good afternoon, I’m Will and am new to this forum.  I’m having an issue with noise/feel in my 2020 1500 TB 4x4 pickup.  It sounds and feels like I’m running over rumble strips in the road but I’m in the middle of the lane.  I lifted it and the drive line and rear end has slack in it way more than I expected.  But it also feels like it maybe coming from the middle of the pickup.  Has anyone else had an issue like this?

[Atlas]

Hi Will, welcome. My first thought is u-joints or a transmission mount going bad, or maybe both. There shouldn't be any slack in your u-joints in the driveshaft. If there is, the joints should be replaced immediately.

[2016 Sierra Owner]

Sounds like it could be your 8 speed transmission acting up as well. Most describe a rumble strip feeling when it acts up. 

[garagerog]

OP, how many miles on your TrailBoss? Might help us point you in the direction of the U-joints or TC.

Edited November 28, 2025 by garagerog

[newdude]

Rumble strips in an 8 speed????  Fluid swap unless you've got too high mileage.  

[Munster4x4]

Yeah, my first thought was u-joints also,but they are tight. There is about a 1/4” -3/8” twist in drive shaft at rear yoke and pinion.  I did not check transmission mount.  Pickup has 100+K miles.