1988-98 Chev & GMC lowering parts 

These trucks use the control arm / spindle set up in the front as did the previous GM trucks. There were two different spindles on the 1500's that can cause some headaches if you don't pay attention. If the truck is a 1988-91 regular cab, not 454 SS then they use a spindle that takes a 1" thick rotor setup. Everything else takes a 1.25" thick rotor that needs a different spindle. The bearings and calipers are also different so if you get the wrong spindles it's not a matter of just going out and getting a different set of rotors. But we have also seen the odd truck that should have the 1" rotors that actually has 1.25" thick ones so the only safe way is to bust out the tape measure. Good news is you can usually measure without even taking a wheel off.

In the rear is a standard leaf spring setup. A shackle will get you 2 inch drop, shackle / hanger combo gets you 4 inch drop and a flip kit will give you 6 to 7 inches. (The difference in drop with the flip kit is the thickness of the leaf pack. To figure out how much drop you will get measure from the bottom of the axle to the top of the leaf and add about 1/4", this will get you pretty close)

This is also the first generation that we have parts available to lower the 4x4's. Use a set of keys in the front for about 2 inches of drop and the rear is the same as the 2WD trucks.