I went through my entire drivetrain on my 1960 K10 a while back. Replaced seals, bearings, u-joints, etc. The original leather seals were still on the truck after 45 years. Needless to say the driveshaft yolks had some really nice grooves in them. I was then faced with the dillema a replacing the yolks or going with a speedy sleeve. I went with the speedy sleeve due to finances at the time. I'm wondering what you guys thinks. Which is the better route?