Did mine recently, found a place that sells the whole kit for $500. I went with 3:36. Bob is correct about the after market ratios. I could not find much taller, but since my orig was 3:55 and a bit too low 3:36 was about right for me, also a 4spd. The kit included an Auburn carrier (others were also available), seals, gaskets, posi additive etc. used my orig 8.2 BOP housing and axels with new bearings. Total was about $1000 with labor.