What's the largest tires I can run on my 79 bronco with 9" rear (31 spline mosher shafts) and stock 44 front? I have 8" lift. The truck is used for mud and light trail running, nothing too hardcore! I'm thinking about getting lockrights front and rear because they're cheap and if the axles grenade I can upgrade to 10.25/14bolt/60/70/rockwell or whatever I need. How long would 40's last with this stock setup? Where can I get rockwells cheap? Thanks for any ideas or advice!