Well I gave my 98 tow rig some new life. Last spring I had a 383 stroker, holley sniper, rebuilt tranny ect all tossed into the truck. I tow my camper, quad & gear which wights in around 7k or so a lot. The 3.73 gears with my 285/75/16s just aren't cutting it. So after lots of research & homework I decided to get a set of 4.56 gears tossed in to really help out puling my trailer... Rather stay on the low end of the gearing as I can always upsize my wheels if I need too... Goes to the shop on Monday... looking forward to it!!!!