Replacing the rear leaf springs on a classic C10 is one of the most straightforward suspension jobs you can do, but choosing the right spring pack matters a lot. Go too stiff and the truck rides like a brick. Go too soft and it sags under load.
This thread covers stock replacement vs lowered vs lifted spring options, spring eye bushing materials (poly vs rubber), and what shackle length does for your ride height. We also discuss the importance of a proper U-bolt torque sequence.
For a complete front and rear lowering package, the Pomya Suspension Lowering Kit for 1963-1972 C10 includes both front coil springs and rear components for a matched drop.
What spring setup are you running and how does it feel?