I think the front springs on my truck are shot.

I have looked at the bushings, the spring bushings themselves seem OK, the upper front shackle bushings might be pretty well gone.

However, even if that bushing IS gone, the passenger side sits lower than the driver's side, and both sides are very close to the bumpstop (more than I would think just a bushing would fix)- how much distance is there supposed to be stock?

Anyway I found a place that has front springs, but what weight rating do I need with a diesel? They have springs rated 2575, 2755, and 3485 lbs. per spring.