So as I've posted in the past, I am on a quest to reduce and eliminate the "slip bump" my F150 experiences off the line. I've tried a couple different lubes on the driveshaft slip yoke (one piece DS, slip yoke at x-fer case shaft) with poor results; MC ptfe lube is the best but still wears out in under 10k miles. Right now running 50% MSo2 paste and its a little erratic; 33%/33%/33% for smooth/light/heavy slip bumping. Both the different Ford teflon lubes and the MP50 eliminated the slip bump for at least the first few hundred miles. Really thought the moly would be the ticket.
One problem is cleaning out the old lube. I can get the DS splines reasonably clean but can't do much with the x-fer case output shaft. I'm really getting sick of pulling this DS every engine OCI to grease it. I would happily install a different yoke if that would fix the problem... or pay $$$ for top notch grease/paste if I knew that would fix it...
Open to ideas. These trucks have a couple locations that can cause slip bump, of which the splines are most common. As noted, I'm pretty convinced its the splines as the problem does initially disappear after fresh lube. Do I need something thicker to resist the shock loads and shearing? Or something thinner with a lower cF? As mentioned above, the three lubes I've tried run that range pretty well.
1. Ford XG8 ptfe driveshaft lube. Light carrier oil with pretty thick ptfe solids. Lasts 5k miles until its totally shot.
2. Ford 'white teflon' grease from slip yoke service kit. Lightweight, super slick. POOR longevity.
3. Jet-Lube MP50 (50% MSo2 paste). Rather heavy duty, medium weight oil carrier with 50% MSo2 solids. Doesn't work as well as the XG8.
One problem is cleaning out the old lube. I can get the DS splines reasonably clean but can't do much with the x-fer case output shaft. I'm really getting sick of pulling this DS every engine OCI to grease it. I would happily install a different yoke if that would fix the problem... or pay $$$ for top notch grease/paste if I knew that would fix it...
Open to ideas. These trucks have a couple locations that can cause slip bump, of which the splines are most common. As noted, I'm pretty convinced its the splines as the problem does initially disappear after fresh lube. Do I need something thicker to resist the shock loads and shearing? Or something thinner with a lower cF? As mentioned above, the three lubes I've tried run that range pretty well.
1. Ford XG8 ptfe driveshaft lube. Light carrier oil with pretty thick ptfe solids. Lasts 5k miles until its totally shot.
2. Ford 'white teflon' grease from slip yoke service kit. Lightweight, super slick. POOR longevity.
3. Jet-Lube MP50 (50% MSo2 paste). Rather heavy duty, medium weight oil carrier with 50% MSo2 solids. Doesn't work as well as the XG8.
