My 96 z28 gets a really bad grinding noise when starting. It only does it sometimes. Mainly when it is cold. I havent got into checking the starter yet, but i think it could be a combination between that and the ring gear of the flywheel. It still turns over, but sometimes it takes a few tries. Anyone think this could be the problem? If so, do you know how big of a job the flywheel is? Thanks.