Hey guys, i have searched the posts and couldn't find anything close to my little issue here. I always assumed i had 3:55 gears in my rear end bc the door code says H9 witch means the 3:55's. i just bought a Diablo predator tuner and when i brought up my gear ratio it was at 3:73s so i thought huh, i left it and finished my tune, the truck ran great.....lots and lots of torque, than i thought better switch to 3:55 sense that's what my door says, after that tune, not even close to as much torque i had with the 3:73 setting. what is going on here? any ideas? other than maybe the truck has 3:73's and the door code is wrong?

oh ya, its a 2WD truck.

 

most tuners come with generic tunes so that could be it or your truck had a tow package upgrade after the factory

 

Most programmers use "placeholder" values when changing from the stock tune. It puts a value there (ie 3.73) instead of being blank and then looks at the stock tune to find the ratio when it does the tuning.

 

cool cool thanks guys. appreciate it

 

Yeah someone was on here a few days ago with the same issue. I have 3.73 gears so when I first got my Evo I didn't think twice about it. It's like otto said.

 

Thanks Tuna