Manual Steering Box Rebuild Questions

Gear lube is added when maintaining the gear (in vehicle).
Grease is used when rebuilding.
Why?
Because grease is a mix of oil, a thickener and additives. When the lubrication level in a box got low, it wasn't from the loss of thickener, but the loss of the oils. That, and grease put into the fill hole may sit on top for a long time. The lube will flow down.

For rebuilding, there's not a lot of info out there. The Ford and GM boxes aren't that different than ours. I could only find one of the early Ford specs on-line. Not too helpful as it called out components rather than performance. Maybe a tribologist could get more out of it than I did. The GM spec changed several times, but one interesting point was that the Corvette's got a slightly thicker grease, apparently because the engine compartment was hotter.
So for an mopar A-body with a v-8, headers, etc, a NLGI 2 Lithium or Lithium complex base is probably the best for rebuilding.

Mr Dart said

I know this is an old topic but I am wondering the same lubrication issue too and this is what I found. Following is direct citation from original 1964 Dodge technical service manual.

"Every 6 months the lubricant level of the fluid should be inspected and if necessarry replenish to the level if filler hole with Multipurpose Gear Lubricant as defined by MIL-2105B. Use SAE 80 for temperatures ranging above- 30F, and if SAE 75 for temperatures below- 30F. If SAE 80 is not available SAE 90 may be used."

And they add a warning too:" CAUTION: DO NOT USE A PRESSURE GUN."

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