Yup...that's it. Both sides of the axle are directly tied together. It doesn't slip what so ever. It's cheap, cost of a few welding rods, but VERY permanant. On-road handling suffers, just as you saw with you buddies, and it's hard on tires. Off-road, it is what it is, full power to both wheels. If I myself were to "lock" a D-35 (what you have), it would be by welding it. The D-35 is a weak axle, and not worth throwing the money of an actual locker at. You would be better money spent up-grading your rear axle to a Ford 8.8 or D-44. You can get the axles at a junk yard or Craig's list for cheap (couple bills maybe), then spend the money on the right lockers. You probably have 4:11 gears now, so that is what you need to look for. Swapping out axles is not that big of a deal. If your wanting to go cheap, weld the D-35, and when it eventually breaks, and it will, up-grade to a bigger, stronger axle.