Super Duty 4x4
Slip Yoke Servicing
F250 4x4 XLT Sport Crew Cab
few months ago, I started noticing a weird feeling in the drivetrain on
take-off. Kind of feels like the transmission slips just a little.
After some research I found this is a fairly common problem and the fix is
usually to re-grease the slip yoke in the driveshaft. I found a pretty
good writeup on this procedure here
but I'm not sure what type of Super Duty this was written for, but mine was
setup different. Maybe just a difference in model year or maybe because
mine is a crew cab...?
is a technical
service bulletin regarding this problem as well. Ford recommends to
use Motorcraft PTFE Lubricant but when I tried to buy it from my local
Ford dealer, the parts guy told me that he doesn't stock it and that they just
go to NAPA and buy any brand of "good" grease and use that.
here's what I used on this try... Its a synthetic blend and it lists U-joints
and CV joints so I thought I'd give it a shot. If it doesn't last, I'll search out and
pony up for the good stuff next time.
picture shows how the slip yoke is arranged in my truck. I marked the
orientation so that I could put it back exactly as it was.
spent some time making some unnecessary alignment marks. I've never had it
apart before so I wasn't sure if there would be an opportunity to get the
splines misaligned. Turns out you cannot connect the slip yoke incorrectly
because there is one "double spline" allowing only one way to connect
it. You only have to remove the front clamp (red arrow) to get it
you're careful, you can re-use this clamp. Otherwise, I think others have
just used a cable tie.
four 8mm bolts to get the front U-joint loose.
it backwards a little, drop the driveshaft, and pull the slip yoke apart.
Looks like it could indeed use a little more grease...
a little dry down in there as well. You can see the "double spline"
location on the right side in this pic.
applied plenty of grease to the splines. Way too much actually as most of
it got pushed out when I reconnected the slip yoke assembly. Oh well, I'll
know to use less next time!
just reverse the removal steps and you're done. This turned out to fix the
problem I was feeling. For the moment its smooth as glass on
take-off, time will tell how long it lasts...