1. i want to run 36's or 38's 2. it's a 72 40 3. i want lower gears 4. i don't want to worry about breaking birfs all the time. D60's are to bulky for my taste. Ford 9's don't seem to have any major advantages. i'm just thinking now i should buy some 77 or later fj40 axles under it. this will give me disks, fine splined ring gear, birfs worth of smurfing. is this right? how much do i need to spend for a set of axles? how much can i sell mine for?