Saw/found said truck online/out of state and seems like a decently equipped truck for a XLT. Supposed to have trailer tow pkg, so am thinking it should have sway bars as well. Factory sprayed in line...
I seldom find any use for a locking diff. Whether to go 3.55 or 4.10 gears has most to do with how you will use the truck ..... On highway towing 18000 - 25000 lb rv the 3.55 will out pull the 4.10 as often as vice versa. Starting out in low gear in soft ground or on steep grades the 4.10 has a clear advantage.