@mjb929rr What is the difference in the 400 and the 450. I am in no way mechanically inclined or versed. I am in the medical field. The dealer seems to think the 400 will be ok with the 1.76 trans. He told me there isn't really a big differnece between the 400 and 450. I won't be getting a 550, but would entertain the 450 if it is needed. Anyone else have any input or suggestions on 400 vs 450? Thanks.

Thank you all for the suggestions so far.