I have a 1999, TL, Auto Tran. with a shifting problem into 2nd gear. My questions are: 1. Can the 2000 TL eng. and/or tran. be directly exchanged with the 1999? 2. Is the tran. removable w/out pulling engine also? 3. How can I tell if the engine is an OBD2b (which I am told are directly exchangeable)?