Hello I just changed my Transmission because someone drained it by accident thinking it was the Engine Oil so i had to Refill it with New Fluid.The Car has 115,700 miles on it..I mean it seems to be running fine but Im worried about the Tranny Going Eventually..The only problem i had was parking on a hill and Backing Up it..I had to Gas it a little but I think thats normal(I think?)Would changing this make my car last longer or shorter?I need Advise/Help...Thank you so much..