I bought a 74 challenger for $1000 and was told the motor needed replaced. I pulled the u-joint off and started the motor and found out it was the pump howling.When i manually spun the pump i heard a ball bearing even drop! Bought a replacement 12wj with a b impeller for $150 when i bought it i spun it and it was definitely not as loud as the bad pump i pulled out. It still made a little noise though. I havent greased it yet either, gotter re tap a grease fitting in before i do that, threads are shot.Just curious on if you are supposed to hear the shaft turning at all or if a little rotating noise is normal. shaft is tight and everything else seemed fine. Any help would be appreciated before i go out on the water and get my heart broke! Thanks, Blaine.