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warmonger
Hard-core CEG'er

Reged: 08/16/01
Posts: 5810
Loc: Ozark, AL
Re: Speedometer Gear
#421540 - 10/03/03 11:43 PM

Originally posted by DemonSVT:
News flash.

The axle ratio is programmed into the PCM.

I would be surprised if the 2 gears were different actually. We are not talking old school direct drive cables to a mechanical speedometer.


Yes that also means for all those that installed the 3.84 final drive your speedometer and odometer are now off. Well unless you let the PCM know via a chip of course.




I won't argue that the gear ratio is in the computer, or that you can change the speedo by changing the ratio. However, nothing else changes if you change final drive gears and leave the computer alone. You will not get speedo error. What you will get with a different final drive is lower engine rpm AT the SAME speed.

Look at it logically: The speedo only measures axle rotation via the differential. The diff and the tires spin the same speed all the time as they are locked together. The speedo is driven off the diff.
In this situation nothing has changed by changing final drive gears, therefore the speedo will still report the same number of wheel revolutions as it did before.

On my chart, 180 tire revolutions is 13 MPH. So even if the diff had a different final drive, once it reached 180 revolutions the speedo will read 13MPH.
I hope you can see what I mean after this, I can't seem to put it any clearer and the explanation isn't that great.
BTW:
On our cars that final drive ratio slot in the computer is worthless.


--------------------
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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* Part #'s Upgraded MTX 75 Transmission shift forks+ warmonger 05/20/03 01:32 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Kremithefrog 02/16/06 01:47 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Bill J. at Team Ford 02/16/06 05:17 PM
. * Synchro part numbers ssmumich00 03/04/04 06:15 AM
. * Re: Synchro part numbers GTO Pete 03/25/04 07:48 PM
. * Re: Synchro part numbers 99REDSE 06/23/04 07:35 PM
. * Re: Synchro part numbers DemonSVT 06/23/04 08:41 PM
. * Re: Synchro part numbers 96_98_SE 09/23/04 11:35 AM
. * Re: Synchro part numbers midway22 11/18/04 01:32 AM
. * Re: Synchro part numbers OutlawdSVT 01/04/05 04:18 AM
. * Re: Synchro part numbers dukeofsho 04/07/05 03:19 AM
. * Re: Synchro part numbers Bugzuki 04/09/05 04:27 PM
. * Re: Synchro part numbers GTO Pete 03/04/04 11:46 PM
. * Re: Synchro part numbers ssmumich00 03/05/04 04:46 PM
. * Re: Synchro part numbers Swazo 03/05/04 06:33 PM
. * Re: Synchro part numbers Blackcoog 03/09/04 10:19 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ myfastse 03/02/04 11:04 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ CJ98 02/06/04 01:51 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ ssmumich00 02/06/04 04:37 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ CJ98 02/07/04 12:11 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Blackcoog 02/17/04 09:19 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Blackcoog 02/24/04 05:36 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ ieffem 02/26/04 01:38 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ ssmumich00 03/01/04 08:58 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ DemonSVT 02/06/04 08:43 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ bigerik 12/19/03 05:21 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo warmonger 12/19/03 01:35 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo bigerik 12/19/03 02:30 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ ssmumich00 11/24/03 05:39 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Judge 08/18/03 08:58 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Lance KinleyAdministrator 07/31/03 04:32 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo shotwell 08/22/03 06:34 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Rev. Po-Jay 10/01/03 02:58 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo ssmumich00 10/01/03 04:03 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Rev. Po-Jay 10/01/03 08:13 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo warmonger 10/02/03 02:07 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo Rev. Po-Jay 10/02/03 05:44 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift fo warmonger 10/02/03 08:34 PM
. * Speedometer Gear DemonSVT 10/03/03 03:48 AM
. * Re: Speedometer Gear warmonger 10/03/03 11:43 PM
. * Re: Speedometer Gear DemonSVT 10/04/03 04:31 AM
. * Re: Speedometer Gear brianl703 12/22/03 11:49 PM
. * Re: Speedometer Gear warmonger 10/04/03 02:34 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Blorton 07/24/03 04:53 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ 1314 05/20/03 03:59 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ MotorCity 05/20/03 04:37 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Bill @ SigLM 01/06/04 10:04 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Bill @ SigLM 10/18/03 10:55 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ ssmumich00 11/24/03 05:13 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ kinger 05/20/03 06:04 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Livinsvt 05/21/03 01:19 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ TorsenRick 05/21/03 12:14 PM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ TGO 05/21/03 02:05 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ warmonger 05/21/03 02:25 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ fordrule 06/25/05 09:16 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ kinger 05/21/03 06:11 PM
. * Pictures of Warmongers Transmission Barge 05/22/03 12:05 AM
. * Re: Pictures of Warmongers Transmission bamf2go 05/26/03 11:27 PM
. * Re: Pictures of Warmongers Transmission warmonger 05/28/03 03:14 PM
. * Re: Pictures of Warmongers Transmission Lance KinleyAdministrator 05/28/03 06:57 PM
. * Re: Pictures of Warmongers Transmission warmonger 05/30/03 02:40 AM
. * Re: Pictures of Warmongers Transmission Bradness 01/12/06 02:38 PM
. * Re: Pictures of Warmongers Transmission todras 01/12/06 03:03 PM
. * Re: Pictures of Warmongers Transmission Bradness 01/13/06 02:05 AM
. * Re: Pictures of Warmongers Transmission ctmystique 01/30/06 03:04 AM
. * Re: Pictures of Warmongers Transmission todras 02/16/06 05:32 PM
. * Re: Pictures of Warmongers Transmission todras 02/28/06 01:34 PM
. * Re: Don't feed the trolls warmonger 01/13/06 02:14 AM
. * Re: Pictures of Warmongers Transmission TorsenRick 06/17/03 02:54 PM
. * Re: Pictures of Warmongers Transmission Kool Aid 06/28/03 09:35 PM
. * Re: Pictures of Warmongers Transmission RayWee 07/08/03 02:36 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ TGO 05/21/03 03:08 AM
. * Re: Part #'s Upgraded MTX 75 Transmission shift forks+ Livinsvt 05/21/03 04:45 AM

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