1990 Chrysler Newyorker with 115k mi

Have a nice 90 chrysler newyorker with 115k. This vehicle has been elderly owned and driven since new. Interior is clean with the headliner starting to drop but has not drop yet. Was told that it might need a sensor for the transmission but the car can be driven asis. The trans changes gears but when you get to 30mph it dont change until it gets to 40mph. It does not slip. It just dont change until 40 mph. This car runs drive and ride good.Dont need anything but the trans looked at. Everything else works good with no dash lights on. Car can still be driven on the expressway and 80mph. Car is starting to rust in lower front fender and bottom rear as you can see in pics. Car is for sale locally so i have the rite to end the auction early. 500.00 (none refundable) is due at the end of the auction. Please ask questions before you bid. Thanks for looking and god bless1995