40-55mph bounce in driver rear of bed

[Heavy-chevy]

Straight to the point: I have a 2008 Chevy Silverado 1500 LTZ 4x4 with 6 inch lift and 35s, there is a bounce in the driver rear of the bed at 40-55mph then smoothes out, this problem started slowly about a year ago and has gotten worse, there is a little shaking in the driver seat and as well in the steering wheel, this is everything that has been done:

*New drive shaft front and rear, double checked the balance of both

*new u joints for both drive shafts

*transmission was rebuilt

*New transmission mount 

*New front end suspension (All)

*New front wheel hub bearing assembly's

*New rear shocks

*New rear rotors

*New rear axles and bearing

*New 35 inch tires and rims ( all been balanced and rotated several times still bounces in rear left of bed)

*300 LBS put in bed of truck but still bounces 

The body lines look to be straight from cab to the bed and measure same from ground up, like i said this problem started out slowly and gotten worse.the The truck drove smooth as butter a year ago. Pretty much have a new truck now with all these parts changed LMAO but it still bounces in the rear driver of the bed..Need some input fellas

[mikedeezxxx]

Straight to the point: I have a 2008 Chevy Silverado 1500 LTZ 4x4 with 6 inch lift and 35s, there is a bounce in the driver rear of the bed at 40-55mph then smoothes out, this problem started slowly about a year ago and has gotten worse, there is a little shaking in the driver seat and as well in the steering wheel, this is everything that has been done:
*New drive shaft front and rear, double checked the balance of both
*new u joints for both drive shafts
*transmission was rebuilt
*New transmission mount 
*New front end suspension (All)
*New front wheel hub bearing assembly's
*New rear shocks
*New rear rotors
*New rear axles and bearing
*New 35 inch tires and rims ( all been balanced and rotated several times still bounces in rear left of bed)
*300 LBS put in bed of truck but still bounces 
The body lines look to be straight from cab to the bed and measure same from ground up, like i said this problem started out slowly and gotten worse.the The truck drove smooth as butter a year ago. Pretty much have a new truck now with all these parts changed LMAO but it still bounces in the rear driver of the bed..Need some input fellas

I kind of have a similar issue. Started when I had a wheel alignment done a few months ago at one of those shady wheel and tire shops. 2016 Silverado Z71 Crew Cab w 6” lift and 35’s. Haven’t had a chance to address this problem yet. I’m gonna have to go to 4 Wheel Parts to get realignment. They are the only ones in my area that can do it properly. It drove very smooth until the wheel alignment.


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