knezat225

I have a 2015 F150 and going with a 8" lift and 37's I want to change my gears to either 456 or 4.88 but I cannot find a programmer that will adjust tire size and gear ratio. Anybody know why the 2015-2016 cannot be adjusted?

dhmcfadin

Forscan can handle that for you.

knezat225

From what I read you can only change to factory settings. 37" tall tires and 4.88 gears wouldn't be factory. Anybody have experience with this?

tmcolegr

Are you referring to changing axle ratio & tire size using IDS? If so, IDS has not been able to change those parameters in the F150 starting with 2015, even to settings that were available as factory installed.

knezat225

Yes I am referring to changing those parameters. I cannot find a solution

tmcolegr

You're not going to find an OEM solution.

The tire size and axle ratio can be adjusted using FORScan or you can look at an aftermarket solution (Hypertech Speedometer Calibrator or In-Line Calibrator or an aftermarket tuning device w/custom tune)

knezat225

Can I adjust to those sizes using forscan? Anybody have experience with that?

tmcolegr

You need to search the FORScan sticky thread.

zukmeister

I adjusted to 35’s with forscan

locknload

I'm going to 35s and 4.10s as soon as the install kits come in so I've been looking for a solution as well. I've searched the huge Forscan thread and must have missed it because I'm still looking. I looked at NGuage with 5Star tunes but I don't think they're doing gear adjustments yet.