Steering gear

if its manual it will be orginally filled with a water resistant grease
feel free to try pumping more in. or just do as most do... top off the box with gear oil... go for a drive so the heat from the headers gets into it
check on return and if necessary top off again...

they were orginally filled with a specific grease that was very clingy it was potentially similar to 1950s MARFAC 2 or mopar multimileage ... it sweated out a bit of oil when stressed or warm and kinda consumed it again when cool...

modern NLGI II red stuff can be used, BUT doesn't sweat out the oil so bunging in some 90 gear oil kinds assists in the same way...

i have opend a number of manual boxes for ratio chnages and found Modern RED mobil NLGI a kind translucent clear blue green stuff and plain old grey moly HIGH pressure stuff

none of the boxes had suffered too much ware.
2 of them had the top bearing cage smashed but had been used on cars with no slip joint/pot coupler. chassis flex then smashed up the input bearing

as far as i can tell most damage to manual steering boxes occurs when OVER adjusted or NEVER adjusted.

out of adjustment 1 way or the other kills em
too tight obvious ware
too loose the teeth chatter, ballnut in sector, in the straight ahead position, and wear

Dave