I posted before, but about gears, so i dont think anyone answered my question. I have 4.10 gears, but yet to install them. Once i get them intalled, do i need a new speedometer?
or can i recalibrate it...how much will this cost

 

What year stang do you have?

99+ you can recalibrate with just a tuner.

98 back you have to either use a speed gear (which isnt nearly enough for 4.10's), or a speed cal.
https://mustangforums.com/m_1139702/tm.htm

 

thank god, i got a 99

so can i recalibrate myself? or can i get it donw

how much does it cost

 

where can i get this gear?? i have a 96gt with 3.73's

 

Don`t buy the speedo gear. They aren`t accurate. Get a speedcal. They are dead on.

 

Exactly. the 23 tooth gear is made for 3.55's.. anything over that it wont do you any good.
I ordered my speed cal off of mustang tuning. when you order, you will see a coupon field... put mustangboards in there and you get a discount as well

Speed cal - click me.

 

Would anyone be interested in selling me their SpeedCal?

 

I've got an '89 LX and just upgraded from 14" wheels to 16". where can I find a speedo cal?

 

with a 99 up you can used a hand held tuner or there are afew companies that make speed calibration boxes that work in a simlar way but have to be wired in or you can go with the gear its self. lots of choices with your car.