I know that the hemi power steeringt pump puts out too many psi for the old power steering pumps. I know that S&P makes a GM pump that will work. I also know that someone out there makes a mopar pump that somehow reduces the psi to work with the old pump. Does anyone know how to modify the hemi power steering pump to put out lower psi or which specific GM pump they are using for this swap? This is a 66 coronet it's going in.

if your running hydroboost then the s&p pump will not have enough psi.... if not it will work well.....been there done that...hope that helps