Well I have recently changed shocks from Pro-Comp truck shocks to the Rancho XL9000 series adjustable socks and have noticed a positive change.
My tires used to unload after the hit and wad up before they spun producing a very poor 1.7 60' time
Now since installing the Rancho shocks I have cut my 60' down to 1.41 on a marginal starting line.
The good shocks took the bounce out of the rear end and I am happy now and can see mid ten second ET's on the horizon
Gus