i recently changed my steering box after the old one was leaking good. The problem is the new one seems to have no assist from the power steering. I jacked the front end up and i can turn the wheels easily but when trying to turn when not jacked it is near impossible. Is this just a bad box? as it was a rebuilt one or is there something else wrong? The p/s pump is also pretty new and that did work before the installation. Any ideas?