The Stovebolt Site Forums The Shop Area Driveline 3 Speed Shift Box Lube

I am rebuilding the 3 speed shift box on my '52 1/2 ton GMC that is mounted at the bottom of the steering column. Does anyone know what type grease it is supposed to be filled with? I could not find any mention in either the Chevy or GMC shop manuals. Mine looked like it had wheel bearing grease in it.

A lot of people use "Corn Head Grease" purchased at Tractor Supply or John Deere. It's a farm impliment grease.

I have used that in my steering box, but was not sure about using it in the shift box. I am a little concerned that it may tend to leak. Has anyone had first hand experience with it?

Use of a "soft, smooth grease" is referred to in the lubrication section of the Truck Shop Manual. Wheel bearing grease would be fine.

GEAR SHIFT CONTROL HOUSING
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0006.htm

if the rubber boot is present and in good condition there should be no problem with leakage with any "self leveling" grease like Cornhead Grease - I've always used a moly grease and it works fine sticking to the metal in extreme heat applications, the parts don't move far or fast but it can get hot next to the engine .... also, contrary to the wording of the manual, I wouldn't "fill" the box with grease

Bill

Thanks for the information.