KingDEL23

I have a 2000 ML55 that I have been fixing up to use for this upcoming winter and one of the remaining items is getting to the bottom of the caster issue the car has. It appears that the previous owner hit a curb of some sorts and totally destroyed the RF upper control arm. I've replaced that alongside the inner and outer tie rods on both sides. I got the alignment done and the car does track straight but exhibits some erratic behavior (pulling, tramlining, etc). After looking at the final alignment specs it shows the caster angle is off nearly 3 degrees. Does this indicate possible frame damage or is it probably more a symptom of a bent control arm? Although it would be difficult to tell based on just a visible inspection, I do not see anything visibly damaged or bent. Suggestions?