The bellhousing on my C4 transmission has a few old age / stress cracks. They are only visible from inside and are not deep. However, I would like a second opinion regarding whether I should replace it before the cracks get worse. I have added pictures below. On one hand, a brand new one is about $230, which is not cheap. These cracks are not new and there is a chance they won't grow anytime soon. On the other hand, if it breaks while I am driving, there is the potential for costly damage. Plus, now is a convenient time to replace it, since I already have the engine out of the car. Opinions?