I had the SJ class II double flex system on my 97 1/2 ton. It was a pretty decent kit once the bugs were worked out. I ended up ditching the SJ shocks and went with custom valved bilstiens with ressy's, made a world of diff. I too had problems with the track bar bracket, so I fabbed one up out of 5/16" plate. It helped, but when I sold the truck it was starting to shimmy again. I had at one time went with the 2" spacer with the 5. 5" lift (it is 5. 5 on 1/2 tons, not 4. 5) and it wouldnt clear 40x13. 50's. so I went back to the 5. 5 with 37's. All in all, a pretty good kit. However, I aint buyin another one for the cost!