Before I completely removed the stock driveline of my '68 145, I noted that the rear end was listing to the driver's side more and more as time went on. At one point I measured and the driver's side was 2 inches lower in ride height on the rear than the passenger side! It looked horrible, but I figured it was a sagging spring, and because everything was being replaced, it would go away with the new equipment.

Flash forward to today, when the new 4.10 rear diff, rear Bilsteins, and rear overload springs with updated upper spring seat went in. When the car was back on its wheels, I measured ride height again, and noticed the drivers side rear was still sitting 1/2" lower that the passenger. I'm not sure what side to side slop is expected in these cars, but a variation that big seemed to much. It's just noticeable with the naked eye. Note that I've rotated the tires around to eliminate them as a suspect. It does this the same way irrespective of tire orientation.

What makes this more mysterious is that the donor car for these overload springs had a 3/4" spacer between the upper spring seat and the chassis just on the drivers side, almost like the donor car had the same issue as mine, and it was being corrected by artificially raising the drivers side! What's weirder is that the spacer looks like it came from the factory, not jury rigged. I thought it was weird, so left it out on my install.

So the question is, do these cars have a built in driver's side sag in the rear? What was the deal with that spacer? Any why was my car sagging to the driver's side with two completely different rear end suspension setups?