Im looking to replace the trans pan gasket but Im not sure whether its best to buy one online or use the "cut your own gasket" type stuff i have. (i figure specific ones could last longer)? In order to look up the proper gasket online, I have to know the engine type and transmission, and because the original engine was switched...im not sure if the transmission was aswell. The original was a straight 6. The engine in it now is a V8 ...302. because those werent made in that size for that year....im really clueless as to how to look up the gasket i need. help? My transmission pan has been leaking for over a year, but as of recently (4 months or so) i have to put a half quart of transmission oil in every other day at least.