Molly or hypoid

[mack]

When reinstalling the middle drive unit, do you use molly or hypoid to lube the middle driven gear socket (female)and the middle drive unit drive spline (male)connection?

[clcorbin]

I'm pretty sure the manual calls for not just a moly lube, but a high concentration moly lube. The stuff almost feels like a warm wax it is so fully of moly. But double check the manual. It will spell it out.

[BA80]

The manual is 30 years old. I have the 850FD mod and it's been working flawlessly with the spacer mod with just plain old wheel bearing grease for 50 - 60K miles. That coupling doesn't slide anyway.
Just sayin'

[bikerphil]

That spline shaft should be getting lubed from the gear oil in the unit itself.

[mack]

Lube

The FSM and the Haynes don't mention anything about lubing this connection but it stands to reason that something should be used. If you look at the lube chamber, I don't think the hypoid would get up that high to hit this joint unless there is a lot of splash going on. I just don't see that happening with two 45 degree pinion gears. They mesh so tight that it would be more like a slow blender in a cake mix. Thats why I asked. Your right though in that the shaft and socket have no movement other than rotation. I'm going to lean toward the molly.

[DiverRay]

Either one will work. I used Mobil 1 Wheel bearing grease on mine, and it's still good 60K later. The REAR DRIVE NEEDS MOLLY! It has a LOT of pressure, and rides in and out as the back wheel goes up and down.

[clcorbin]

The REAR DRIVE NEEDS MOLLY! It has a LOT of pressure, and rides in and out as the back wheel goes up and down.

That's the one I was thinking of! Sorry!