Well there are 6spd Manuals for the HEMI in the 2500 line-up......... The only problem is that your truck is a automatic and is NEW......... Wait until that thing wears out and then replace with a Manual. At least wait until the Warranty is up on it before you go messing around. The best thing is to look for older HEMI Trucks with the 6spd Manuals. These will bolt right up but you will have to change out the wiring, pedals, tranny brackets, drive shaft/shafts.......... Good Luck.
welcome to the forumZ happy to see you here, i have looked into the same thing for my 01 but the cost of the change over is more then what i paid for the truck it would be cheaper for me to trade mine in for an 09 6spd