i hate dodge

i have always hated dodge/mopar----well after early 70s anyway--our elderly neighbor gave his 2007 caliber to my wife a few years back low mileage mint condition -well after 4 years its starting to break down and i found out i still hate dodge lol---had to do struts/shocks--its rusting fast underneath--when in gear and going slow makes weird vibrating sound and i think its tranny but no noise i have ever heard from and auto tranny---also passenger airbag stays on--gonna try changing tranny fluid and clock spring and go from there----other than that it really has been a great car----any help on those two things would be great!--------------mike