The YJ's high-pinion, reverse-cut Dana 30 front axle is generally considered to be stronger than the earlier CJ version. Some people don't like the vacuum-operated axle engagement and the lack of locking hubs. However, Warn makes a locking-hub kit that eliminates the vacuum function. And for brawn, you can upgrade to larger U-jointed axleshafts from Stage West. Also, ABS-equipped Wranglers have larger U-joints than non-ABS rigs. Finally, building up a 30 is far less expensive than swapping in a 44 or 9-inch, and you get more ground clearance.