I’m in process of replacing my transmission 06 ram(125k). Normally I think it’s good practice to replace any worn things to avoid doing the work twice. However my rear main seal is dry and not leaking at all. I is stock and yes rubber does go bad in time. But should I just leave alone or replace rear main seal? I’m not concerned about the $ but removing this to disrupt the seal along with pan and possible causing a leak . Is it true dealer rear seals are the same brand as felpro??