Hi all I checked my RTI today on a 25 deg ramp. I am not sure if this is very good for my combo or not but I scored a 788 on the ramp. The info on the blazer is 1979, 2.5" stock length springs on the front, 7" long shackles moved forwards and gives another 3/4" lift. I have installed 14" shocks front and rear. I have removed all spring clamps for more droop. The rear has a shackle flip.