I just fixed my gearbox, being able to say that gives me a warm fuzzy feeling.
When mine started acting up my line of thinking went like this: If I can pull the gearbox myself that will save me some money. Then I thought, if I pull it I may as well crack it open and save a little more money. So I built a flange puller and bought a hydraulic gear puller, lets pretend I needed one of those anyway. After I cracked it open I realized how simple it really was, it wasn't like a tightly wound clock at all. I replaced the worn parts slapped that baby together and I'm on the road.
What I mean to say here is that you probably could have fixed that ol' gearbox yourself. Heck if I can do it...
"The secret to a long life, is knowing when it's time to go"
"The best of men is only a man, at best"