I have a 4x4 yes.....Gears cost me 700 after shipping..Then I paid 500 to get them installed..Which was a good price..As for Free mods I don't know..What year do you have..There is a few things in the DIY section.

 

03ram 4.7

 

Just making sure you had a 03...Look up TMR delete..Thats free..Im not sure where your Air intake temp sensor is but if its in your intake manifold you can move it to a colder spot like your Intake tube pre Throttle body(or make a power wire)..Taking off the clutch fan helps out but you need to replace it with a electric fan..The home made sonnax line booster is cheap also..The TMR delete and the sonnax line booster are for the tranny, but it helps..You delete the top hat that says 4.7 Magnum on it also..But you have to find a pipe or something to connect you to the air box...Really everything is going to cost something..I can not think of anything free other then the TMR delete...