Changing gears in a 2002 dodge ram 3500 4x4 diesel?

i have 4.10 gears in my 02 ram 3500 4x4 diesel i am wanting to change them because i dont get much top end out of the truck and if im running 70 the truck is maxed out for RPM so someone was telling me to change them to a 3.54 gear ratio does this sound right? also the truck has a 6 speed manual trans in it and i dont wanna lose 6 gear. also where would be the best place to purchase these new gears? i dont use this truck to haul anything heavy or any big trailers so i know going down in gear size wouldnt hurt me for what im using the truck for. would this help me for fuel economy and if so how much better fuel economy do you think i would get? thanks!!Changing gears in a 2002 dodge ram 3500 4x4 diesel?
if you do change those out,you know there's two sets of gears that have to be changed,front and rear,you will notice a slight change in the take off power of it,it will be different,on the highway though it will drop your rpm,s a slight bit,so you should gain a little on top end and mileage,if you ever pull a load though especially on the highway that may be where you,ll notice the change the most,good luck with it.Changing gears in a 2002 dodge ram 3500 4x4 diesel?
you will be fine with 3.54 gears you shoulg try to get them at your local speed shop cause you dont want to buy them from the dealer cause the price will kill you just remember to change the both sets of gears front and back cause if you dont do both of them and you put it in 4wd you are looking for trouble cause the front tires and the back tires will be spinning at diffrent speeds