SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
Doublecheck your gear ratio. Stock gearing was 3.27, it's of course not impossible but I find it unlikely that anybody would go to the trouble and expense of installing gears that are only 0.28 shorter than stock. The overwhelming majority of people don't bother with anything numerically less than 3.73's.
As far as tune, that's hard to know for sure. If you feel like paying a Ford dealer to plug in and look at it then that's one possible way. Since the car has so much Steeda stuff though I am willing to bet that if it is tuned, the previous owner probably purchased a device and custom tune from Steeda as well. I am not positive at all, but just as a guess I'm thinking they may have a way of looking up the car in their records via VIN and may be able to tell you if they've written a tune for that car.
Another good indication is if it runs crappy (detonates under load) on 87 gas but run great and no detonation with 91/93 gas. Although of course the p/o could have just installed a "gas saver" tune for 87 as well, but most people are cool enough not to do that.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4