Look at lifts for 1/2 ton 1973 to 1988 GM trucks. The front and rear components were changed very little over the years. 2wd truck lifts over 4" will be a little harder to find because of the front suspension, the steering and geometry get bad. Off the shelf rear spring lifts go as high as 6". At one time it was popular to convert to 3/4 ton rear springs to compensate for the extra rear weight Suburbans carry.