# New gears = Messed up Speedometer **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [February 27, 2007, 11:58am UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290 "2007-02-27T11:58:28Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![04Mustang232](https://avatars.discourse-cdn.com/v4/letter/0/df788c/32.png) [@04Mustang232](https://forums.speedlife.net/u/04Mustang232)\ **Post date:** [February 27, 2007, 11:58am UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/1 "2007-02-27T11:58:28Z")
i bought 4:10s and t lock for my car a while ago, and i want to put the damn things in. I dont want to until i find out how to fix my speedometer for obvious reasons, anyone have any idea where or how i can fix this. Thanks ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 11:59am UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/2 "2007-02-27T11:59:10Z")
whats wrong with the speedo? ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:03pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/3 "2007-02-27T12:03:50Z")
I’m pretty sure you’re speedometer is electronically controlled on the 2004. You’re going to need to retune to fix the speedo. I know my 2004 Mach 1, I had to reprogram it only when I switched to 4.30s Purchase a pocket programmer, or goto a place that offers dyno tuning. I know the older style SN95’s (94-98) could correct this issue with a proper speedo tooth gear size. May want to double check and see if you can just do this instead. I think they cost about $80 ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 12:07pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/4 "2007-02-27T12:07:05Z")
> [@welcome to buffalo?](https://forums.speedlife.net/t/welcome-to-buffalo/28364/30): > > I’m pretty sure you’re speedometer is electronically controlled on the 2004. You’re going to need to retune to fix the speedo. I know my 2004 Mach 1, I had to reprogram it only when I switched to 4.30s > > Purchase a pocket programmer, or goto a place that offers dyno tuning. > > I know the older style SN95’s (94-98) could correct this issue with a proper speedo tooth gear size. May want to double check and see if you can just do this instead. I think they cost about $80 oops, wasn’t sure what he meant adn now i do, what about laurel mountian stangs? couldnt they reprogram it? ---
**Author:** ![DTMVENG24](https://avatars.discourse-cdn.com/v4/letter/d/da6949/32.png) [@DTMVENG24](https://forums.speedlife.net/u/DTMVENG24)\ **Post date:** [February 27, 2007, 12:07pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/5 "2007-02-27T12:07:46Z")
Handheld tuner. ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:10pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/6 "2007-02-27T12:10:29Z")
> [@Switching to Verizon Wireless](https://forums.speedlife.net/t/switching-to-verizon-wireless/28318/10): > > oops, wasn’t sure what he meant adn now i do, what about laurel mountian stangs? couldnt they reprogram it? I dont think they have an open license for tuning Mustangs, since they dont really have a garage or diagnostic equipment. Rodeheaver could probably do it though. and I checked, speedo tooth gear wont work on 99-04 stangs, have to go through the ecu to retune it. what kind’ve power are you looking to put down with the v6? I know a lot of guys who have supercharged and turbocharged the V6, and made about 350hp or so, and snapped that stock 7.5" rear like a twig. I would’ve prob bought an 8.8 out of a GT and swapped it on, for the cost of opening up the diff, and installing everything, probably would’ve been a bit more, but cheaper in the long run. ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 12:30pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/7 "2007-02-27T12:30:46Z")
> [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/13): > > I dont think they have an open license for tuning Mustangs, since they dont really have a garage or diagnostic equipment. Rodeheaver could probably do it though. > > and I checked, speedo tooth gear wont work on 99-04 stangs, have to go through the ecu to retune it. > > what kind’ve power are you looking to put down with the v6? I know a lot of guys who have supercharged and turbocharged the V6, and made about 350hp or so, and snapped that stock 7.5" rear like a twig. I would’ve prob bought an 8.8 out of a GT and swapped it on, for the cost of opening up the diff, and installing everything, probably would’ve been a bit more, but cheaper in the long run. Y would u need a license? same thing as power tuner or HP isn’t it? ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:31pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/8 "2007-02-27T12:31:46Z")
> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/2): > > Y would u need a license? same thing as power tuner or HP isn’t it? those things can only put a tune on 1 vehicle at a time… changing the speedo calibration is considered a written tune ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 12:34pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/9 "2007-02-27T12:34:15Z")
> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/3): > > those things can only put a tune on 1 vehicle at a time… changing the speedo calibration is considered a written tune Written as in software right? ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:36pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/10 "2007-02-27T12:36:20Z")
> [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/16): > > Written as in software right? once you save a change to the pcm/ecu with one of those things, it VIN locks itself to that vehicle. Until you unwrite what you did… i.e. restore the defaults ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 12:37pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/11 "2007-02-27T12:37:17Z")
> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/7): > > once you save a change to the pcm/ecu with one of those things, it VIN locks itself to that vehicle. Until you unwrite what you did… i.e. restore the defaults Ahh i see, i thought it was as simple as a tune or software rewrite programm ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:38pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/12 "2007-02-27T12:38:01Z")
> [@free AIM client for smartphone? winblows 03](https://forums.speedlife.net/t/free-aim-client-for-smartphone-winblows-03/28384/6): > > Ahh i see, i thought it was as simple as a tune or software rewrite programm if you have an open dealer/tuner license for the programs ya then it works like that, but those usually cost a few $$ but usually a retailer like Laural Mountain, wouldn’t have a need for a license like that, since they do not do service work at their facility, just retail. ---
**Author:** ![imported\_Sleeper](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/imported_sleeper/32/5939_2.png) [@imported\_Sleeper](https://forums.speedlife.net/u/imported_Sleeper)\ **Post date:** [February 27, 2007, 12:39pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/13 "2007-02-27T12:39:02Z")
> [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/17): > > if you have an open dealer/tuner license for the programs ya then it works like that, but those usually cost a few $$ > > but usually a retailer like Laural Mountain, wouldn’t have a need for a license like that, since they do not do service work at their facility, just retail. well that sucks for him then ---
**Author:** ![obi-1](https://avatars.discourse-cdn.com/v4/letter/o/ac8455/32.png) [@obi-1](https://forums.speedlife.net/u/obi-1)\ **Post date:** [February 27, 2007, 12:50pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/14 "2007-02-27T12:50:04Z")
> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/3): > > those things can only put a tune on 1 vehicle at a time… changing the speedo calibration is considered a written tune I picked up a hypertech programmer for about 150 on eBay for my truck. (Maybe 170?) You can only use it on 1 vehicle at a time. You just type in what gears you have and tire size and it calibrates the speedometer for you. ---
**Author:** ![BlueZ06](https://avatars.discourse-cdn.com/v4/letter/b/5f9b8f/32.png) [@BlueZ06](https://forums.speedlife.net/u/BlueZ06)\ **Post date:** [February 27, 2007, 12:51pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/15 "2007-02-27T12:51:32Z")
> [@Hi!](https://forums.speedlife.net/t/hi/28374/9): > > I picked up a hypertech programmer for about 150 on eBay for my truck. > (Maybe 170?) You can only use it on 1 vehicle at a time. > > You just type in what gears you have and tire size and it calibrates the speedometer for you. yup, exactly what I was explaining. Unless you have the actual software thats usually used from a laptop or desktop computer and a tuner license, the handhelds are worthless unless you actually purchase one for just yourself ---
**Author:** ![tom\_vito](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/tom_vito/32/6000_2.png) [@tom\_vito](https://forums.speedlife.net/u/tom_vito)\ **Post date:** [March 1, 2007, 3:00pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/16 "2007-03-01T15:00:54Z")
> [@another full custom trunk job 76 lesabre........](https://forums.speedlife.net/t/another-full-custom-trunk-job-76-lesabre/28387/2): > > Y would u need a license? same thing as power tuner or HP isn’t it? > [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/20): > > yup, exactly what I was explaining. Unless you have the actual software thats usually used from a laptop or desktop computer and a tuner license, the handhelds are worthless unless you actually purchase one for just yourself Good info. I didn’t know this… ---
**Author:** ![04Mustang232](https://avatars.discourse-cdn.com/v4/letter/0/df788c/32.png) [@04Mustang232](https://forums.speedlife.net/u/04Mustang232)\ **Post date:** [March 2, 2007, 3:28pm UTC](https://forums.speedlife.net/t/new-gears-messed-up-speedometer/188290/17 "2007-03-02T15:28:41Z")
> [@Whos ever gotten poison oak????](https://forums.speedlife.net/t/whos-ever-gotten-poison-oak/28363/13): > > what kind’ve power are you looking to put down with the v6? I know a lot of guys who have supercharged and turbocharged the V6, and made about 350hp or so, and snapped that stock 7.5" rear like a twig. I would’ve prob bought an 8.8 out of a GT and swapped it on, for the cost of opening up the diff, and installing everything, probably would’ve been a bit more, but cheaper in the long run. im not looking anything like that really, just the 4:10’s maybe a cam over the summer and all the bolt ons, 350 is outta my reach. But an 8.8 has definiatly crossed my mind once or twice, but right now i think its unneccesary. thanks everyone for the imput [rmpoutlet.com](http://rmpoutlet.com) sells a programmer plus underdrive pullies for like 400 and the programmer will fix the gear and speedo problem