Spilotro

I have decided I am going to go to 4.10s in my 2003 GT auto. I want to stay away from the engine for now (may or may not do a swap later on), and this seems like one of the best performance increases per buck I can get. Any objections to that?

So, what kind of hell am I getting into? My business partner and I have plenty of tools to do any mechanical work, but what about the other odds and ends that come with modding a newer car? Any programming to be done?

Thanks in advance!

PurpleIcedGT

4.10s FTMFW. Speedo will be off, will need either a speedo calibrater or a tuner to recalibrate it.

H0SS302

For your auto I would strongly consider 4.30s.. that ish would own.

As far as a gear swap is concerned, as long as you have the correct measurement tools to dial in the necessary locations you should be good.

Youll need some better tires, a decent suspension and a tune to fix the speedo(you dont need a tune but ur gonna want one later on..a speedcal is wasted money).

WhiteFoxGT

Do you have a press? Slide hammer? Bearing race drivers? Powerful impact gun? e8 inverted torx bit? Dial indicator? Air hammer with miscellaneous chisels?

I could go on, but if you say no to any of the above, dont attempt it

Rockwell28

to be on the safe side pay a few hundred and take it it a shop to get it done.

Spilotro

I don't have to do anything with the transmission in terms of shift points, etc.?

4.10 is the lowest I will go, so as to not harm my fuel economy. I have pretty much figured out that I can get about the same or better with 4.10s, provided I keep my foot out of it and don't drive like a goon (might be easier said than done!).

Thanks for all the help so far!

Spilotro

Is this true?