I got the arms installed and found the spindles did not need reamed. the threads were just a little rougher and would not quite go in the hole unless helped. action sent me a new set and they went in the hole but looked identical so it was a very slight difference. I am now trying to figure out why the left upper control arm is just touching the spring when extended. that is when the shock is at outer (lowered) position. which only made about an inch of difference in ride height. I got my 1st test ride through the big desert whoops and it handled them good.