Use a set of keys in the front for about 2 inches of drop and the rear is the same as the 2WD trucks.Slamming a full-size pickup is an approachable project for enthusiasts looking to drive something different from the lifted 4x4s that make up the majority of modified trucks on the modern landscape. This is also the first generation that we have parts available to lower the 4x4's. 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) (The difference in drop with the flip kit is the thickness of the leaf pack. 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. In the rear is a standard leaf spring setup. Good news is you can usually measure without even taking a wheel off.

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. 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. Everything else takes a 1.25' thick rotor that needs a different spindle.

If the truck is a 1988-91 regular cab, not 454 SS then they use a spindle that takes a 1' thick rotor setup.

There were two different spindles on the 1500's that can cause some headaches if you don't pay attention. These trucks use the control arm / spindle set up in the front as did the previous GM trucks.

Single cab lowered obs chevy