Changing seals and noticed that when I turn turn the drive shaft in forward,reverse or neutral, if Iam pushing down(in towards the pinion gear, not side to side) there is a slight noise and rubbing or bumping feeling. If i pull out on the shaft everything turns without any bumping or noise. The amount of play in and out is no more then a 16th of an inch I would guess. My question is when new water pump is installed and new seals , and when the lower is reinstalled on the motor will the drive shaft be pushed down resulting in the noise or will installation take care of the issue? Or do I have a bigger problem and need to look at shims or check the pinion gear?