BlueBossS197 said:
My concern here is this: Do all of you who had 4.10's or any other gear installed, does your engine warning light come on or the message center display a warning message after the gears were installed? It's my only concern for whenever I have these installed.
No it does not come on. The only thing that this change affects is your speedometer and your auto-transmission shift points, slightly.
This can all be fixed with a tuner such as SCT Xcal II or a Diablo. But I saw in another post that you were worried about a tune messing up your warranty, yes it will. So you may just want to live with the speedo being off for a while.
Or there may be some type of calibration gear/tool out there, there was for older Mustangs, but I dunno about our new breed
Also, you probably already know this, but a gear change is completely noticeable, feels like a stronger car, Ford techs will know about it, and they will not warranty anything that they feel was caused by the gear change (i.e. transmission, rear-end, etc)
An option might be to call your dealer, talk to the service manager of managers, and ask if you had them order and install the gears if they'll put in writing that they'll warranty them and still honor all other warranty issues
If they agree, get it in a writing, and pay the outrageous rates they charge at the dealer, it may be worth it