Christ, another POGE. He should've notice the rear main seal was leaking. It's not hard when you have the tranny and flexplate off and staring right at the crank. I'm willing to bet, the shifting problem is a result of wrong tranny fluid. You must go to a Dodge dealer and get the fluid for the manual transaxle for the NVT-350 tranny. If they say ATF-4, don't but it. Tell them you want 2 quarts of the mopar NVT350 tranny fluid. It will say NVT350 on it. Rear main seal shouldn't cost you more than 7 bucks. Takes like 5 minutes to install. If they charge you more than 7 bucks, then go to NAPA and ask the guy at the counter. You want the rear main seal for a 420A engine, non turbo 2.0.