I know these two systems are completely different as 65 has hoses from pump directly to steering box and 63' s have pump, slave cylinder and control valve but both of my 63's are way harder to turn than my 65. My 65 you can turn with your pinky but both 63' s are more difficult so just wondering is there a adjustment in the control valve or is it just the way the earlier set ups are? I have tried several different pumps so I know it's not that as it's the same no matter what pump I have tried and both of my 63's are exactly the same which is no big deal just wondering on a rainy Sunday.