have 04 ram 1500 pickup(quadcab-shortbed). have driveline vibration only when on gas. this truck is fulltime awd.does this in 4wd,as well as awd. when I pull front drive shaft vibration goes away. had frt shaft checked and balanced. helped but did not resolve. all u-joints good. frt half shafts are new, as well as stub shafts in front dif.( I know they are common). truck has mild lift kit(im told its a rancho leveling kit. looks like torsion bar keys and frt shocks). has anyone seen this... im thinking that front 1/2 shafts cannot compensate for angle of suspension lift.thanks, Gregg.