i changed my 99 to blue. it looks really good. they are tinted blue naturally though so it might be difficult getting that red you probably want. look on superbrightleds.com they have really good lights to replace them with and they are decently priced. the specific bulb to replace is pc194 my truck had 5 if i remember correctly. i bought 7 though because i also changed the blinkers to blue. good luck with getting the red you want. post pictures when youre done.
I just got my ram yesterday and its a 2010 but i got a sneeky feeling the newer ones are not the p 194,im thinkin led..Still new to the trk so i am just guessing..
i changed my window leds to blue as well. they are 3mm leds soldered to the board. it was kinda hard to replace though. you need desoldering braid to wick up the solder.