Doesn't look progressive like my 5305. I'm fairly certain the nnbs sit the same or slightly higher than the nbs based on the drops I've done on new bodies. I do love my 5305s tho, best riding coil I've found on these trucks hopefully the 4230s ride nice or better with the helper bags and about 20psi to bump up the spring rate. I hope to get the truck perfectly level at all 4 corners with the isolators and helper bags, tires have to tuck just slightly and I'd be so stoked.