Re: Rear d-shaft max angles/cv joint wear
As far as I can remember, it is suggested to keep the u-joint to 7 deg. or less. They can tolerate up to 10 deg, but have increased wear and may vibrate. The vibration problem often occurs when the front and rear joints are running at different angles. With the two joints in the cv canceling each other out, the rear joint should be as close to straight as possible. On my 88 (stock height), the rear u-joint is just about straight at normal running position. When you lift truck, the rear u-joint becomes angled and causes many of the vibrations. If you haven't allready, try lowering the t-case and get angled shims for the rear axle.