I bought my 3" c-notch pre made, it is a bolt on kit ( very easy and clean install ), i first took my shocks and springs out and rested the frame on the diff, made a center mark on the frame from the center of the diff, marked my pattern on the frame and cut it out with a grinder ( cutting wheel ) Then bolted in the c-notch. took me about 4hrs to do, hope this helps bud