BC4x4.COM four wheel drive, 4x4, offroad and fourwheeling site. There are some times of automotive work that most Shade Tree Howley Monkeys avoid.
Driveshafts are fairly heavy, they can be quite long, and they turn at high speeds.
Because of this, they require precise construction techniques and proper balancing. Having the proper tools and skills is crucial to successfully modifying a driveshaft. But like most things, there are exceptions to this rule. For your average 4x4, the rear driveshaft must be straight and balanced. The front driveshaft, however, can get by with looser tolerances.