I have heard a few times about speedcals. I just had some 3.73 gears installed, so is it absolutely neccessary to get a speedcal? Where exactly would I get this done? Ford? About how much?
It takes very few wires and plugs straight in to the trany, I put mine tucked behind the traction control,fog light,and defrost trim by the gear shifter. It's a bout 120 bucks and I got it from dallas mustang also. It is worth it unless, like they say you are getting a chip soon.