If the dealer installs 3.73s, does the car need to be reprogrammed to correct the speedo or to readjust the traction control settings etc?

Thanks for your time and advice...

 

Yes.

 

^^^ +1

 

FRPP also sells a speedo recal box, but if the dealer is going to do the install they should be able to flash the PCM for the gear.

 

What I did in my old stang was the mods that would benefit from a tune first (like a CAI on the 5.0s) and got the tune as well. Then I added the gears and emailed my tuner and he sent me my tune with the gears adjusted and I just put it on with the tuner.

 

+1, I did same.

Get a CAI + tune first. Then do gears when you have the money and you'll be able to adjust it yourself with your tuner.

 

I want to get the gears now so they will be covered under warranty vs me having an aftermarket shop install the ring/pinion.

CAI and tune may come later.

I'll be sure to post to let you all know how it goes.