4 degrees is a little light. How tall is the lift, what size tires do you have, and are your control arm lengths adjustable?I just had an alignment and my caster angle was measured at 4 degrees, is this a problem?
There is a cam bolt kit made for the front axle that allows the caster angle to be adjusted slightly. IIRC its range of adjustment is only something like +/- 1.5 degrees. but it might do the trick. Otherwise a pair of adjustable length arms would be the way to go.I'm in total agreement and would like to get back to 6. The 4 degrees is from a computer alignment printout (LF3.9, RF4.0)
What is the best way to fix this, the alignment tech mentioned eccentric bolts?
I'd go for 6 degrees but if that causes any new vibrations which would indicate that caused excessive pinion angle, just drop back a tad on the caster angle until the vibration goes away. I'd think you'd be able to get 6 degrees without problem with your amount of suspension lift.