I've searched the internet and found lots of great info. Except I still cant narrow down which are the best to get? The springs I put in last year were rated at 1950lbs and the Cummins ate them up with a 2 inch re-arch on new springs. The spring sites give me more choices of, 2150, 2200, and 2775lbs rating for a 73-87 3/4 ton Chevy. But then the 73-87 Blazer has the 2350lbs rating. And the 1/2 ton Chevys give you the same ratings as the 3/4ton. I'm looking for the flex, smoother ride, durability against the weight of the Cummins. Plus the 200lbs bumper on the front. So if anyone has experience with these please let me know.