The Caltrac system creates a pseudo-4 link using the leaf spring and what Calvert Racing calls the "Force Transfer Links", which are the large turnbuckle-type rods in the kit. I ran into a few small issues because of the Belltech lowering leaf springs I have on my truck, but as you will see, everything worked out very well. Mar 11, 2019 · 1988-1998 GM Trucks LS Conversion Kit This swap kit is for 1988-1998 GM ½ ton 2 wheel drive trucks and SUVs. It was designed around our GM LH8 oil pan. Unlike most LS swap parts on the market this kit replaces the frame brackets in addition to the mounts so you'll have clean mounting of your engine and not a mix of parts that are weak and don't work together properly.