Slip Yoke Problem

Please either replace the Slip Yoke type of Drive Shaft on the F-150 Super Crew or modify it so that it may be maintained using a grease fitting and eliminate a $150-$200 expense every 15,000 miles to grease it. Currently according to my service person, the drive shaft must be removed and greased and this takes about 1 hr to 2 hrs.

Frank Seeby