I have greased my slip yoke with Ford's special grease way to many times to have it go right back to the shudder after about 2 weeks. Does anybody know of an alternative way to fix the slip yoke besides this 2 week fix? Someone has to make a better slip yoke?, Where can I purchase one?

Please Help

Thanks

 

im not convinced it is a slip yoke issue any more i get it at random times sometimes i dont get it at all, i talked to a few people that are mechanics and they says there is something called spring slap comeing from the leaf springs . could this be true who nows

 

I got this from Driveshaft Specialists website:

FORD F150 "BAD VIBRATIONS" - We have solved the hi-speed vibration problems associated with late model (up to 03) Ford trucks with Extended Cab and 4 door Cab. Many people have had tailshaft bushing and seal failures associated with hi-speed vibrations. Some have even had complete transmission failures - multiple times. Our local Ford dealers have had a fitful time with these trucks due to driveshaft design. The OEM shaft is a 1 piece aluminum measuring from 77 to 78.75 inches long. IT IS TOO LONG and gets a whip or jump rope effect at high RPM.

 

what web site did you get this from