Part 1 — Swapping out the transmission filter, gasket, and oil — Ah, sixteen. The first blush of adulthood’s setting on you. Young. Excited. If you’re a human. If you’re a cat, sayonara. A car, sheesh, you’re decrepit. Age is relative. In this series, I’ll talk to you about my DIY mechanical work on my 2006 Dodge Grand Caravan. I plan to…