tutone56

Does anyone know why Ford doesn't offer 3.73 with the automatic? I am considering upgrading but was curious as to why it was not an option. Could it be that it's not a good idea to change them out?

SirKnightTG

I think it's lame they don't offer it. But when you do the math, 3.73 on an auto ends up being the same as 4.10 on a manual due to different ratios in the trans and Ford does not offer 4.10s (only Ford Racing).

Nuke

Assuming you're looking to step-up from 3.31's it would be an excellent choice. If you have 3.55's, then I wouldn't bother going to 3.73's. The benefit of the later isn't worth the cost.

VistaBlue GT

what gears did the GT autos come with? my window sticker doesn't say.

CutterWolf

3.31's are the stock gear for GT autos

tutone56

I do want to upgrade from stock but I was just a little curious why Ford doesn't offer the option. From what little I can gather on the forums regarding automatics, 3.73's would be a nice improvement over the stock (3.31) gears.

65Raven65

I thought it was the other way around. In other words, to get the benefits equivilent of a 3.73 with a manual, you would have to go with a 4.10 if you have an auto.

Of course I could be wrong.

antonio1988

and in saying so you were indeed wrong lol! Final drive ratio of an automatic s197 with 3.73s is the same as 4.10s in a manual. If you think 4.10s in a manual is easy to spin the tires, you will literally light them up in an automatic because we multiply more torque than a manual

65Raven65

Ahh, thanks! LOL I dont mind being wrong. (from time to time)

CrazyHorse0217

Make the change..........but get the FRPP's and a good installer.