I have read several topics concerning flash tuning the 05 for enhanced performance. However, I only want to re-calibrate my speedometer for the new 3.73 gears that were installed. What is my best solution?

I'm interested to see these replies. Once we get the answer you have to tell us your thoughts on the 3:73 gears. I'm concidering them myself.

I just saw a product on two guys garage. They were fixing up a 96 mustang. They used a product to recalibrate the speedometer. It had dip switches inside so that you can put your specs in. I think they said that it was from Dallas Mustangs. Sorry I dont remember the exact details.

A '96? I don't know about that one..... I put 3.73s in my '98 GT and had to replace the speedo gear... it wasn't something that could be flashed.... I think it was the same situation for all years up through '04.... I believe the '05 is the first year that a flash recalibratoin is possible for the speedo.

I hope there is a way to do it cheaper than paying $325 for an Xcalibrator. Maybe I'll check with the dealership.

no kidding.... when I put my speedo gear in, it cost me $15 and about 7 minutes (including time to wash my hands).... I wonder why the guys that swapped the geears didn't recalibrate it themselves.... perhaps they didn't have the equipment to reflash it... I'd go knockin' on their door and see if they have any suggestions.

I just called my local Ford service department. The guy said $70 to recalibrate my speedometer after I have the 4.10s installed.

The question has never been answered as to where the speedo signal comes from. On the Lincoln LS and 2 seat T-Bird it somes from a wheel sensor. So you can change gears and the speedo + odo still read the same no need to re-cal. Recal is only required for tire size changes.

Hasn't anyone here purchased shop manuals for the '05 so we can answer this question for once and for all?

speedo pickup is internal to the tranny, and it's not gear driven as far as I know. So your tuner or Ford do it through the OBD-II interface.

Like I said it was a 96 on the show. I am not sure if the car had a different speedo installed but they installed a product that they said took care of the speedometer calibration.

I found the link
http://www.dallasmustang.com/index.mvc?Ses...b22b8e&p=973101

They may have misstated the year of the car they were working on.

Scratch that. The service department just called to say that their software will not allow them to change the gear ratio to 4.10. Currently they are only allowed to change it up as far as 3.57:1. Something to do with EPA approval. darn treehuggers! I'll be getting that diablo predator sooner than I thought.

I guess that's a good thing because now I'll have a better excuse to give to my wife to get the tune done. :)