Tom Wood's offers driveshafts for the JK using both 1310 and super-beefy 1-ton 1350 joints. The 1310s (left) generally are strong enough in most applications. But if you have huge tires, a lot of horsepower (swapped-in V-8), or are just really hard on equipment, you should opt for the 1350s. We went with 1310s in the front and 1350s in the rear. We also chose the Tom Wood's extreme-duty rear shaft, which is made from 3-inch diameter, 0.120-wall steel (compared to 0.083-wall standard tubing). The thicker tubing allows the driveshaft to take a ding or two in the rocks.