Originally Posted by Oldfordisbetter
This is my first post on here. Been a member on PSN for years. Anyways i git a '97eclb 4x4 auto (new from ford still under warranty) with 4.10 gears. I have just recieved a tymar intake ,ts 6chipp, and 5" diamond eye turbo back w/6" tip. Intake will be installed tomorrow. Exhaust n chip in this weekend. With the exhaust. Will b ordering guages real soon. I have 4.10s. It. Its got 4" lift and brand new mastercraft a/t2 305 70 16s. Do i still need 4.10s? How much of a pain is it to swap out gears if need be? With it as is stock im seeing 14-15mpg. What can i expect as a gain with the basic 3 done? Wile im here i notice when i fill up the front tank it leaks a little. Do i replace whole tank?
I love my 4.10s would change them at all and i run 33ish" tires 305/70s are 32.8" basically a metric 33.
as for changing gears if it is your first time pay someone to do it and ask if you can watch. you need the gears and a bunch of "special" tools (special here meaning most guys don't have them)
14-15 mpg is not bad for a lifted truck with oversized tires. did you take into account that your speedo/odometer might be slightly off with the larger tires? about 3% over stock. you want better mpgs put it back to stock height with stock tires.
adding the basic 3 will net you maybe 1-2 mpg if you drive like a grandpa. gauges are a good idea glad they are on the list. you should also look into custom tunes they are much better than standard ts tunes