12. Installing the Yukon shafts is just as easy as the factory shafts. The big thing is to make sure you get the right shafts for your truck. To be safe, measure the area at the bearing surface. There are two possible dimensions, 1.620 and 1.705 inches, with the former generally seen on '97 and '98 trucks, and the latter on '99-and-up models. There was some crossover, especially in '99, so measuring is important.