Went to change transmission fluid and noticed that there was a drop of fluid at the rear where dirveshaft connects. Seal must be starting to let go. Anybody know how to replace this or do I need to have a transmission shop look at it? Unfortunately I have a small drive line shudder on hard acceleration due to p/o who was involved in severe accident, I think something is tweaked and that is what caused the failure. Any way noticed it after I had already drained fluid so the hour, fluid and filter spent I guess will be a loss.