I have been told the whining noise my car (1970 Chevelle SS/ Turbo 400 trans) makes mostly in park but occasionally in drive and reverse is being caused by a faulty pump in my transmission. Noise sometimes is real loud but on occasion there is no noise at all. Transmission shop stated that if the noise is not that bad and if I do not have shifting issues I could leave it alone. I however, am of the opinion that its not a good thing to drive around with a pump going bad as it could lead to some really serious issues. I am considering getting the unit rebuilt now to be on the safe side but by a different sop. Opinions?