As some may be aware, many late model F150's suffer from a "slip bump" due to lack of driveshaft slip yoke lubrication. This may occur either on two piece driveshafts with a mid-shaft slip yoke as well as on one piece driveshafts where the slip yoke enters the transfer case.
My F150 is the one piece driveshaft where it has the slip yoke at the transfer case. I have been using Motorcraft XG-8 ptfe spline lube up until now but the longevity is just not acceptable. Last servicing was less than 6 months ago and approx 8,000 miles (previous thread I severely over estimated the interval) and the slip bump has returned.
Lets discuss possible options, and here's what I have in mind.
1. Continue using XG8 every 8k miles. Besides being a PITA this also means lots of wear and tear on the transfer case output seal and the rear driveshaft-pinion flange/bolts.
2. Switch lubricants. I'm seriously considering using a 50% moly paste this time. My concern is that I am unable to access the male splines as they are shrouded inside the transfer case- thus I cannot fully clean all the old teflon paste. Also unsure of metal finish/coatings in use.
3. DIY zirk. This does not seem like the best idea as the yoke was not designed for it. No grease channels. No weep hole. Unknown balance effects. Unknown effects on or contamination of the transfer case fluid.
I'd love to hear some opinions from everyone here. I've done a lot of reading over the past couple years and it seems like some people has great success and others experience are more similar to mine. I have also seen some reference to a possible alternative grease for this application from Ford which may be a form of krytox, but I don't know the part number as everybody seems to list the Motorcraft xg-8 or its FoMoCo equivalent number.
My F150 is the one piece driveshaft where it has the slip yoke at the transfer case. I have been using Motorcraft XG-8 ptfe spline lube up until now but the longevity is just not acceptable. Last servicing was less than 6 months ago and approx 8,000 miles (previous thread I severely over estimated the interval) and the slip bump has returned.
Lets discuss possible options, and here's what I have in mind.
1. Continue using XG8 every 8k miles. Besides being a PITA this also means lots of wear and tear on the transfer case output seal and the rear driveshaft-pinion flange/bolts.
2. Switch lubricants. I'm seriously considering using a 50% moly paste this time. My concern is that I am unable to access the male splines as they are shrouded inside the transfer case- thus I cannot fully clean all the old teflon paste. Also unsure of metal finish/coatings in use.
3. DIY zirk. This does not seem like the best idea as the yoke was not designed for it. No grease channels. No weep hole. Unknown balance effects. Unknown effects on or contamination of the transfer case fluid.
I'd love to hear some opinions from everyone here. I've done a lot of reading over the past couple years and it seems like some people has great success and others experience are more similar to mine. I have also seen some reference to a possible alternative grease for this application from Ford which may be a form of krytox, but I don't know the part number as everybody seems to list the Motorcraft xg-8 or its FoMoCo equivalent number.