I got the caltracs for the qc in stock, but on the QC trucks now,
the kit i have is LOW I mean LOW, with the lowering kit I do suggest the rear be welded in , and with the QC you get front springs, front bumpstops, rear flip kit, both rear shocks and the QC kit is $850 shipped,
but on the QC's since everyone wanted them soo low, I do not guarantee against bottoming or vibrations
now on the 05's I havent had too much of a problem with either, the 06 I do not reccomend the kit, it does work but some do vibrate, if you watn some info on the QC kit, hit outnumbered a member here or am trucker 22, both have the QC kit installed on theres for a long time now