I have a 2003 Chevy Silverado 2wd Regular Cab Long Bed Work Truck, i bought the truck new back in 2003,
it has a One-Piece Driveshaft and i have a vibration from 55mph and faster,

i lowered the rear of truck with djm 2 inch lowering shackles in 2004 to level the truck out and put belltech nitro drop 2 shocks in 2009 and never had any issues with vibration,

recently i lowered the front with djm 2 inch lowering front coil springs and i lowered the rear 2 more inches with djm rear lowering hangers for an overall total 2/4 drop and also put 22 inch wheels and tires on it also,


since then i have a vibration from 55mph and over, can anyone give me any help on what the vibration can be and how i can fix it, any help is greatly appreciated, thank you

 

how is the rear pinion angle look? needs to be-2

 

i have tried to put a 2 degree and 4 degree pinion angle shims in the rear and it still vibrates...it just vibrates from 70 mph and faster now , instead of 55 mph and faster

 

I'm Betting it's a balance problem with your wheels. I'd try the stockers & see if it's still there.

 

Measure the angles on your u-joints. Guessing at something like this is silly. Unless you like doing something over, and over, and over, and never really knowing if you're getting closer to the right angles, or farther away from them.

 

Dont have the stock wheels any more, will have to take some off of a friends truck and see if it is the balance....

 

I had boss 20's on my truck & they made my truck shake @ 70. Took them to different places to get them balanced and left there doing the same thing.. See I don't have 20's anymore lol. But this may not be the problem..

 

put my dads stock 16" wheels from his 00' silverado on my truck and got on freeway and no vibration whatsoever, so took my 22" wheels and had them balanced at a different place from the place that balanced them wrong in the first place, put them back on but havent driven the truck yet, i will let ya'll know if the balancing fixs the problem tomorrow

 

If the shop just high speed balanced the wheel and tire assemblies and the vibration is still there, you may need them road force balanced...

 

Glad you got it figured out