Hi 49dream,

Here is a booklet which may be helpful, Servicing 1949 Passenger Car Steering Gear - MTS-49-16 which is similar to the truck.

Another reference is Steering Gear Assembly from the 1949 - 1953 Passenger Car Shop Manual, section 9.

Hopefully in a few months, the 1948 - 1951 Truck Shop Manual will be online.
Hope these are of help.