On the way back from a camping trip, mostly highway, my transmission starting slipping in and out of overdrive on the flat highway. It would sometimes have trouble shifting from 3rd gear into overdrive.

I think my tranny is toast, is it? What are my options?

Also....I am from Ontario, Canada (Toronto area), I am just wondering what my options are, if it is better getting a tranny from across the border or if anyone knows a really good tranny shop in the Toronto area.