I dont think 4.11 is an option? its 3.55, 373, 4.10, 4.56 and so on.
I could find 4.10 rear gears for 450 bucks, and get a detroit locker for around 700.. Installation would run me an additional 300 bucks I think.. But thats just the first place I've asked.
I'll be putting drag tires on my mounty after I get the locker, I'll let you know the difference in times at the 1/8th mile track... Currently my best is 9.9.. I'm expecting to pull 9.2-9.5 with the 4.10 rear gears and lockers..
I've already found rims for 50 buck each online that are 16x10.5.. and I'll be putting the cheapest drag tires on them =P