GT99GT

im about to buy 3:73 gears and i was wondering if when they are installed do they screw up the speedometer in any way. does it have to be modified to go with the gears or do u just install them and call it a day</P>

GSXRIntensity

You'll need a speedcal.

GT99GT

what exactly is a speedcal

N2OJunkie

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Is a speedometer calibrator, needed for all '99 stangs and up if you chnge gears...are you saying that you are going to install the geras yourself?...It is really a job for an experience person, also dont take it to any crappy shop not specialized on Stangs, sometimes they wont even know that a speedcal was supposed to be installed or programed and they will screw your car......I got 3.73's, they are great..</P>

gdear66

Get the gears installed or do them yourself</P>


The speedcal can be bought from several websites:</P>


www.brothersperformance.com</P>


www.dallasmustang.com</P>


Brothers was the cheapest I could find</P>


It is VERY easy to do yourself, just follow the instructions with the kit. Its jsut a couple of wires to tie in is all, and flipping a couple of switches in the box.</P>

N2OJunkie

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Hey man, dont misinform this guy.it is not EASY to install if you dont know crap about how to do it.......GT99GT I recommend you take it to the PRO's. You can easily screw up ypur rear end.</P>

vfast

*L* it will not mess up the rear end..read the instructions well and do it...

w11988

Also, I believe that the speedcal is only for manual trans speedometer correction. If you are Auto, I think it is an computer tweek.

GT99GT

thanks everyone

Black Horse

Hey, anyone with 3.73's what rpm are you at in 5th gear at 70mph?