Once the Pro Comp fixed-yoke kit was in, we were able to take a measurement and order new driveshafts. The Pro Comp kit calls for a 1310 U-joint to be used. It's a bit small compared to the rear GM U-joints and 1350 Dana 60 yoke, but the 1310 U-joint allows for more CV joint travel, something that would be severely hindered if the kit was made for a 1330 U-joint. Driveshafts seem to always be the cost you forget to factor into the project price, and it'll always bite you as driveshafts are not cheap. They added more than $600 to the cost of our project, and that was with some "good guy" pricing.