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Discussion Starter #1
Hey guy's i was wondering what is causing my truc bed take shake around 40-45mph?Anything before or after that speed there is not shaking what so ever and i didn't notice this until i put the lift on.. what could this be if anyone knows and how could i fix this..???
 

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Check all of the bed bolts would be my first stop since its not to uncommon for things to either work loose or break when it comes to beds.
 

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This could be the result of a number of things including tires or the result of the lift. I would recommend starting by taking the vehicle back to where you had the lift done. They should be able to assist you further and have a plan for addressing the issue. Please feel free to keep me updated with any further developments. Thank you again and I look forward to hearing from you.

Tricia, GM Customer Service.
 

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When you put the lift on the year, did you make sure to torque all the bolts to spec, and do it again 250-500 miles later? The shaking you're experiencing could actually be the whole rear of the truck wobbling from a loose bolt that's about to let go. Double-check all your bolt torques.
 

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X2 ,check and retorque all the nuts and bolts that were used with the lift kit after 500 miles. Torque to SPEC!
 

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Discussion Starter #6
yeah i havent had that done that might be the problem i might ask my buddy's to tighten them for me quick one day thanks guy's.
 

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you might also have a balance issue on one of your rear tires...i had a weight come loose once and had a shake at 55 only, then it went away...just a thought...weirder things have happened...good luck...
 

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did you ever get an alignment after the lift was installed?
 

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X2 on the above sugesstions, & also depending on how much you lifted it this has changed your driveshaft angle & put more strain on your U-joints which will cause vibration to show up where you didn't have it before. If this is your problem, it can be cured by putting tapered shims in the rear between the springs & the spring pads on the axel housing, to change the angle of the rear axel housing & decrease the D S angle back to what it was.
 

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you might also have a balance issue on one of your rear tires...i had a weight come loose once and had a shake at 55 only, then it went away...just a thought...weirder things have happened...good luck...
Thats what i was thinking ... big tires are a little more difficult to balance. i also have had to re balance a tire because of shaking...........hope its just that simple if you do a lot of mudding its very possible to have lost a weight
 

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Discussion Starter #11
Thanks guy's, well i'm gonna end up buying some new tires after i get my tax's back. I don't do allot of off roading i only took my truck thru the mud 3 times since i've had it so far ha. CLGOCH yea man i did get an alignment after i lifted my truck because i also put new rim's on also so that shouldn't be the problem. Idk if i lost a weight or not i'll check but sometimes the shop's could also have forgotten and that could possibly be the problem. I'll know for sure after i get my 35
Nitto's on and get it aligned and balanced soon as i get them put on and if it's still a problem after i'll make sure i get all the bolt's retightened to spec's. I will have an update whenever i order the new tire's..
 
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