What kind of "service info" you are looking for?

http://techauthority.com is the most complete on-line reference library
for your truck. The subscription is $20 for 24 hours, $200 for 30 days,
or $1,500 per year. They also sell the factory service manuals and
owner's manuals if you don't want to pay for the on-line subscription.
http://www.dodgeram.org and http://dodgeram.info are worth looking at
but they don't cover everything.