i have no clue on what tires the biggest will fit on my truck with a 3inch body lift or even stock.Right now it has the stock 245/75/r16s sooo how big can i go

 

with a 3 in lift i think you can go all the way up to 35". i have 33" on mine with a 3" lift.

 

By the way its a 2x4

 

33x12.5

 

yes i agree with god ram it. if you try to put 35" on they will rub horribly. If you had a 4x4 you could probably get away with it. But to save the money and trouble of getting rid of the 35's after you find they rub just stick with 33 x 12.5

 

33's

By the way, what is the gear ratio of your rear-end? That is just as much a determining factor as how much room you have in your wheel wells

 

where would i look to find that

 

Should be a sticker under the hood in the top middle. Or you could email dodge and give them your vin and they will e-mail you a build sheet.