I have a 79 K10 with D60/FF14, Detroits and 5.13's on both ends. In the front, I run 8" Skyjacker springs to clear 44" TSL's. In the rear I currently have factory 56" leaves with and ORD shckle flip and 4" blocks. I have the leaves backwards from the factory orientation to move my rear axle back 4". I am debating whether to buy the 4" lift Procomp springs for $260 with my 10% discount or 4" Tuff Country for $360 wiht 15% off shipping. Is anyone running these springs? I will not be carrying any really heavy loads or towing. Does anyone know the spring rates? I'm really tempted to buy the Procomps just because of the cheaper price. What is your input? Thanks in advance!