every truck has a sweet spot for pulling small and medium hills - my truck always needed to be above 2200rpm for any decent size hill, so keep downshifting till its above that sweet spot and not working your truck overly hard. in mine, a little tip of the throttle right before the hill would bring it down a gear and be right in the meat of the powerband. I was running the 3.31 gears - I'm sure your ram with the 3.42 gears would be similar.