Hello everyone, During the course of my '58 Plymouth restoration, I replaced the original power steering box (Constant Control) with a remanufactured later model. I do not know exactly the year, but as the casting number begins with "21...", I'm guessing it might be from the early '60s. Ever since the end of the restoration, I have had problems with the power steering : vibrations in the steering wheel, noises, and the sometimes fluid squishing out of the reservoir cap (from the safety hole). And the hose that feeds the power steering box is always vibrating (it's a NORS hose with the correct "large-then-narrow" profile). I tried the usual suspects : belt tension, power steering box adjustment, ... but the problem is still there. So I'm beginning to wonder if the '58 power steering pump is correct for that later power steering box. Was there any increase/decrease in the pressure needed by the power steering box (and delivered by the pump) during those years ? Thank you.