Had an interesting surprise last night in that my 2002 F250 PSD lost Reverse, 3rd and 4th gears. Overdrive light is flashing, which is supose to indicate a problem, but the Autozone guys couldn't read that code (was told that might be the case). So, I'm feeling I should get in to somewhere and I was hoping for any recommendation of something more reasonable than taking it to a dealer service shop. Somewhere NE Denver would be preferrabel; Thornton, Brighton ish area.

Any recommendations you know to be reputable would be appreciated. Happy Holidays.