i have an 05 crew cab chevrolet....i lowered it 3/5 and now i have trouble with d drive shaft every time i hit aruond 60 mph it hits on the chasis bar that holds the gas tank and i dont know what to do any suggestions please help

 

why would it hit only when you go 60mph? Are you sure it's not hitting when you hit a bump and the suspension loads? What lowering kit did you use? Does it say anything about this in the directions?

 

it doesit when i floor it around 60 and i used the djmdrop kit

 

Are you it is not from the driveline angle?

 

something in the rear suspension must be moving under a load, causing the driveshaft angle to change.

 

if its a single drive shaft its posible you maybe getting shaft deflection underload.. most likely vibrating.. angle probably needs fixing

 

I would shim it first, if it isnt done already, thats a really low 3/5