I just did my 50K Transmission flush (had a local Lube Shop do it) I was driving my truck today and noticed that my truck kept shifting repeatedly at 70 MPH, I don't know if it was because of some headwind that my truck was struggling to keep up or what!! I really never noticed it before and now I'm a little nervous. It hasn't done it anymore but still worried me a little. Anybody have any ideas or comments? Maybe something like "you should know better than to have someone else change your fluids!"