Ok, so I have lowered my 1990 240sx xe coupe on eibach sportlines (yes the lowest springs).I felt some vibration and wobbling in the steering of the vehicle for a long time now and in chasing down the problem, I started replacing things that looked worn in the front suspension.
I removed the front tension rods and replaced them with the adjustable TEIN tension rods.
I removed the torn outer tie rods and replaced them with new inner and outer TEIN tie rods.
I also removed the torns steering rack boots and used new napa ones.
BUT I'm still getting some vibration in the steering when cruising over 50mph. I definitely notice some has disappeared.
I also noticed that my tires are wearing out on the inside, so I decided to get a new alignment, but before that I went ahead and purchased some Ingalls camber adjustment bolts.
These bolts go in upper of the two bolt holes for the lower shock mounting point, and are supposed to give you +/- two degrees of camber adjustment.
http://www.ingallseng.com/parts/81250.htm
I installed with the bolt head oriented towards the front of the car, the arrow on the bolt head pointing inwards toward the motor, and the washer tab pointing away from the car toward the back side of the wheel.
According to the directions, this is supposed to give +2 degrees of camber (I'm hoping this will correct the negative camber from lowering the car).
Now, did I install the bolts correctly? I can't really tell a difference visually - to me it looks like there's still quite a bit of negative camber in the front.....
If it helps, I'll post up some pictures in a bit to show what I'm talking about.