Originally Posted by the persuader
06-07.5 5.9 trucks don't have DPF's in the exhaust and don't require expensive tuners or simulators to delete the emissions.
07.5-12 trucks have all the emissions like DPF and EGR. They have the 6 speed automatic.
Both engines can run a straight pipe exhaust.
The 13+ trucks do not have a way to delete the emissions or tune yet.
Personally, I think Dodge automatics are garbage, so I would go with a manual unless the transmission was rebuilt, or you find an automatic cheap enough.
This is great info summed up for you ^^ I wouldn't necessarily stay away from automatics though. Sure they aren't the best built trannys but if you drive them right and don't put more power into them they'll be okay.
Keep in mind you're looking at two different generations of Rams though. IMO the 4th gens are WAY nicer than the 3rd gens. Especially the interiors. You really need to look closely at all of that with your budget in mind to see what you want to go with.