Application Compatible for Chevy C10 Panel 1963-1967 Compatible for Chevy C10 Pickup 1963-1972 Compatible for Chevy C10 C10 Suburban 1967-1972 compatible for GMC C15/C1500 Pickup 1967-1972 compatible for GMC C15/C1500 Suburban 1968-1972 Feature- For use on short wheel-base, one-piece drive line pickups with 5" drop or more - Adjustable for up to 4 degrees of anti squat - Lower hole is for factory trailing arm position - Eliminates interference with the drive shaft when running a lowered truck - Exhaust passages allow to run up to 3" dual exhaust - Allow for the use of 5 different trailing arm settings - No welding/modifications required Note No Instruction Included. Please feel free to contact us for whatever we can help.