I owned a driveline shop and built a lot of drivelines as many of you know. We always used he Spicer information as our guide (they trained us) and never had any problems, at least no one ever brought a shaft back to my shop complaining about it. We build car, truck, off road, racing and heavy equipment drivelines and the same basic rules apply to all. It is Gospel as far as I am concerned. I've read a great deal of stuff both here and in numerous magazines written by people who didn't understand the issue. Just refer to the Spicer link that Grigg posted and you will have no problems if you follow the instructions. Really pretty basic and simple stuff.
