I put one on a '54 Buick convertible about 5 years ago for a guy. He loves it, rides like a million bucks, and he's had no problems..... On that heavy of a car, I will usually use either Kugel or Heidt's, mainly cuz their arms are all tigged, and really first rate spindles. Some of the lesser quality units are fine on the light cars, but I don't like the idea of a 4500 pound car cruizin' on cast import spindles!!!! The guys at both places are really straight with you (once you get past the phone salesmen!), as long as you tell them what the car is and it's weight and they think it's ok, then it's ok!!!! Jerry Kugel is super straight!!! If he sez it's ok, then it's ok. I've also ran Heidt's on some 4000+ pound cars with no problems.....