Cummings? That's a place in GA, right?
Looks like you just showed up here Kenneth. Welcome aboard. Now look around and try the search engine (it's a tricky one-try "titles only"). The FAQ section for 12v's is really skimpy, but there are tons of information on here for the 12v. The FAQ section is just a late-comer.
I wouldn't waste my time pampering a factory transmission. It'll break or it won't. They're notoriously weak behind the Cummins. Save up for a real nice aftermarket job with billet TC and custom valve body.
Very good write up about filters in TDR some issues back. I use Hastings, Fleetguard, or Carquest. For serious filtration--use a bypass system. On one truck I use Rotella and change it A LOT. The other truck is full synthetic with bypass filtration. Change it every year or two.
Factory service manual: 800 890 4038 (MasterTech) about $100 for the main book, then there are supplements, but I don't have those. The FSM will cover every variation of Ram truck for that year.
39k? I've put 33k on my '95 and started with 141k. I've put over 70k on my 2000-started with 48k.
Don't let that thing rust in position, keep it moving.
