Hey dont wory about your tack, I'm running 4.56 with my 285/76/16's. I put the gears in with 35's on my mind but after much deliberation I chose the 3in and 33's over the 5in and 35. To much climbing in and out for a daily driver, at least for now. When its paid for and I can get something else for a daily driver I'll probably get the skyjacker 7in and a 3 in body lift too, maybe. Any way if you check this link out youll see a guy running helcats with Q78's (36/10.50/16) on them with a 3in lift
http://www2.aeronix.com/~dudleydodge/ Well good luck with you swap and if you go with 4wheelparts and you buy the master install kits they will give you a lifetime no questions asked warranty... you break em they replace em. All in all it cost me $500 for danaspicer gears up front,precesion gears in the back, and both master install kits... and ruffly $500 to have them installed. So check out 4wheelparts the warranty is worth it.