Hi all,
I am hearing everyone talk about 4:10's and all the other gear ratios out there, but I have yet to see anyone say anything about getting the speedometer recalibrated because of the gear swap. I am really considering this, but want to know how much of a pain in the _ _ _ this will be to get it recalibrated. Or will a Diablo do it for you? Has anyone done the swap without a recalibration?

Also anyone heard of 3:90 gears? I heard they are almost up there on the 4:10 level, just not as aggressive. I haven' t seen anyone mention this gear ratio.

 

Im pretty sure this is one of the things your programmer will come in handy for..
Diablo, SCT2.....

 

Ah yes....here you go.SCT features

 

My understanding is that the programmer will do it and its a easy fix - if you know the procedure

 

Unless this transmission is a lot different than all the other trannies out there, there is a speedo gear that you change along with the rear end gears to correct the speedo. There are only a couple of bolts that hold the speedo gear in. Easy to do, you just have to know what tooth gear to correct for what gears you put in the back.

Hope this helps.

Scott

 

Generally speaking, gear ratios run in 5% increments. I know a few people on the board are running 3.90's but they just havn't been as popular as 4.10's and Ford Racing doesn't offer that ratio sale. The ratio is available, I believe thru Motive though.

 

I have 4.10 gears, as well as taller than stock tires, and used the Diablo Predator to adjust the speedo. It is an easy thing to do.

 

If you do not have a programmer, I believe that the dealer can reprogram the speedo. Just make sure that the dealer is cool about mods. Mine was cool about it, just put down that "customer claims speedometer is not accurate....check and calibrate". I'm getting an SCT2, just couldn't afford both at the same time. Hope this helps.

 

This trans is indeed alot different. There is no need to swap speedo gears like in the past. Calibrating the speedo for different tire sizes and gear ratios is very easy with any one of several aftermarket programmers. The ability for so many things to be changed with a relatively simple (handheld) programmer is one of my favorite things about the new Stang.

 

Just to clarify for anyone who may not know, the dealer cannot reprogram the speedometer calibration on these cars as was possible on many of the Fords in the past. Basically, it boils down to the cars being approved for emissions standards with a specific wheel and tire size and specific gearing. Since Ford didn't have them tested and approved with different specifications, the factory computer won't let you change them without the aid of a tuner.