Nathan,
Here is the best advice I can offer on this subject. I do not have a book for this era truck to refer to but I took a look at my friends 64 Impala which has this type of steering system. The Impala has the small line as the pressure side and the larger one as the return. GM is usually fairly consistent so it would lead me to beleive that the truck would be the same.
Once you install the lines in this manner it may or may not solve all of your problems. Depending on what pump you installed it's possible that you could have too much pressure to operate this system and could blow out seals in the control valve or ram. Also too much pressure could cause the steering to be erratic. You can reduce the pump pressure by installing washers in the control valve in the pump. The washer kits are available at most speed shops as it a common procedure when installing a Mustang II rack with a GM pump. You should find out what the operating pressure for this system is and modify the valve accordingly. The later pumps produce over 1300 PSI and your system probably operates at about 800-900 PSI. The shop manual should have this info.
Fred
Last edited by rfs56trk; 11/21/2007 11:50 PM.
