I purchased a High Angle Driveline 1350 rear CV slip yoke shaft for my NP208 last summer and it completely got rid of all my vibrations. Only thing I wish I might have done was get greasable u-joints, the ones used in the CV and at the pinion are non-greasable. Overall I am happy with the d-shaft especially because my K5 is a daily driver and sees a lot of highway and high speeds.