ok. so ive been wanting to get new rims lift and tires for quite awhile now and im finally getting them this week. the tires are 35x12.5x18 Nitto Mud Grapplers (hoping i get atleast 25k out of em!)rims will be 18x9 KMC XD Monsters. and i ordered a 3" Truxxx leveling kit with 3" keys and a 1" block for the rear plus shock extensions. just wondering if a custom tune would help with the bigger tires? i will re gear but that is awhile down the road from here because this sucked me dry for a while. would a torque converter help? just wanting some ideas of what will help the loss of power without regearing. thanks