Here's what it says on the prg site:
This is the strongest kit available for the 4wd Titan. CST uses a ONE-piece (instead of two-piece) subframe and fabricated spindle uprights (instead of cast). Although we've never had issues with other kits, you can be assured that these are the best built and strongest kits. The CST kit is the most complex of all the lifts to install as it requires cutting and welding. The front of this kit is actually about 6" taller than stock and the rear uses a 4" block for a slightly raked look. This kit includes an aluminum skid plate, heim-jointed swaybar end-links, and braided brake lines. You'll need to buy a pair of REAR SHOCKS for use with this kit. This kit can easily be upgraded to front coilovers. If using the PRG UPPER CONTROL ARM, there is no welding needed during the install. An alignment will be necessary after installation.
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