Super Duty & Heavy Duty1999 to current Ford F250, F350, F450 and F550 Super Duty with diesel V8 and gas V8 and V10 engines
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Two weeks ago I dropped the rear torque tube (drive shaft) and performed the grease fitting modification to the slip yoke. The job took me about 45 minutes from start to finish.
I don't know what the heck I waited so long for. I put up with the truck shuttering when pulling out for about four years.
Now it is smooth and makes it a pleasure pulling out from a stop.
If you are thinking about it, DO IT!
Things I used:
12mm 12 point 3/8 socket to drop the shaft at the rear pinion (make sure you mark it's position both at the yoke are rear pinion). Just cut the band on the rubber boot at the slip yoke, no need to remove the band at the carrier bearing yoke stub.
Drill press with a letter "D" drill bit.
1/16-27 pipe tap.
standard grease fitting and grease.
How I did it:
I drilled the yoke just above where the slip tube joins the yoke arms. I then hosed out the yoke to remove any chips and blew it out with shop air.
Installed the grease fitting.
Install the drive shaft.
Greased the heck out of it.
I then used a wire-ty to secure the boot back onto the yoke.
All is well
Last edited by skoveng; 03-04-2009 at 01:32 PM.
Hey that an interesting idea! The only thing I would watch would be don't go crazy when you inject the grease, as if you fill it too full, when the driveshaft starts to move forward under power, the grease won't compress and you may damage something. I wonder how well the grease will migrate to all the splines...
2002 F-350 Powerstroke 4x4 Crew Long bed All black Lariat custom Cobra cb mount, 05 Mirrors, ZF6 mod, Manual Transfer Case
Back in the day ('70's), the slip yokes would come with the grease fittings in them. Never had a problem with too much grease, it always found a way out around the splines. But you never know; pump the gun a dozen times and take it for a ride. You can always pump in some more.
As shown on my page, I used Valvoline Durablend grease on mine. So far its holding up well.
Very nice job on your write up!
I wonder about the grease fitting idea that others have talked about, as far as I know the slip joints that have a fitting also have a groove around the circumference to allow grease to flow to all the splines.
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