2000 mustang v6 5spd speedo/odo issue - Ford Mustang Forum
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post #1 of 21 (permalink) Old 07-13-2013 Thread Starter
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2000 mustang v6 5spd speedo/odo issue

Hi ...... just bought my first mustang ,2000 v6. 5spd

17" cobra look alike rims, lowered 2" front 1.5" rear

the speedometer reads 20mph when driving about 70mph and the odometer adds about 1 mile for every 15 miles driven ......
I have replaced the sensor on the side of the trans cause someone said that could be the issue but that did nothing.

I also read somewhere that someone said it sounds like someone could have tuned it incorrectly as far as gear/tire ratio. Idk if that has been done and don't mind going to the dealer and having the ecu reflashed to stock tune if that will work but I want to try my other options before I take it in.

Also any suggestions on a good clutch/throw out bearing set to use? I'm told they need replaced..

Any help will be greatly appreciated.
Thanks and god bless
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post #2 of 21 (permalink) Old 07-13-2013 Thread Starter
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Also just talked to the people at the parts store and apparently there are two speed sensors?! One that is the regular OSS on the side of the trans and then they didn't know where it is but there is another that says it goes to the ECM? I guess it sends the signal to the ECM and the other sends the signal to the speedo itself... Anyone have any idea of what it could be?
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post #3 of 21 (permalink) Old 07-13-2013 Thread Starter
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Ok... Decided to buy a new sensor just to see if maybe the one Midas installed was faulty... And decided I'd do it instead of paying them... The sensor that I got was just like a rod with no gear on it... The one that came out had a yellow gear on it... The new one , once installed, did not work the needle didn't move at all, so I put the one with the gear back on and test drove it and obviously the same thing as before... Needle says 10 at 30 and 20 at 70 or somewhere real close to that.. Please help!!!!
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post #4 of 21 (permalink) Old 07-14-2013 Thread Starter
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The speed sensor that is in the car right now has a yellow "gear"(it is plastic) on the end. If I look into the hole it goes into(which is very hard to see) it looks like a metal gear up about 3/4 or so of the way up towards the top of the hole...

Any help?!?! Anyone at all!?!?!? Can anyone even see this posting?!? I'm starting to think maybe it was a waste of time joing this forum ...
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post #5 of 21 (permalink) Old 07-14-2013
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I don't know about the 2000, but I just bought a 98, and the gear in the cluster is a POS and needed to be replaced. There is lots of info if you serch here, but again, I don't know if it applies to the 2000.
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post #6 of 21 (permalink) Old 07-14-2013
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FWIIW, the 98 and older Mustang uses a VSS sensor.

The 99+ uses an OSS speed sensor.

The OSS sensor is a non-contact sensor. As such, there is NO GEAR to change. Speedometer adjustments have to be done with a PCM tune.

The output of the VSS and OSS sensors are NOT compatible to each other.

Soooooo If you have a 2000 MY and the transmission has a VSS sensor then likely someone has swapped the transmission from an older car. Perhaps they wired the VSS to the OSS. If so, this is your problem.

Here's some more information regarding the different speed sensors.

http://www.allfordmustangs.com/forum...haft-swap.html

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #7 of 21 (permalink) Old 07-14-2013 Thread Starter
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So how do I know if the trans has been changed or if it is stock? If it has been changed what can I do to fix this other than swapping the trans back to a new style one?
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post #8 of 21 (permalink) Old 07-14-2013 Thread Starter
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Ok I just got underneath and these arethe numbers on the trans I found 3 different sets of numbers:
Rf-f6zr-6394-ac

Rf121938

Borg Warner
19-52-066-939

I have no idea what any of this means but please help
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post #9 of 21 (permalink) Old 07-14-2013 Thread Starter
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I'm not talking about the cluster I'm talking about the speed sensor itself. There is a gear on the end... But apparently there are different type sensors and the one I bought and tried was one of the two magnetic type ones and it fit in, just once installed the speedo needle did not move at all...
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Did you read the information the T45 tail shaft swap?

The VSS sensor has a GEAR on the end.

The OSS sensor has a MAGNET on the end.

As stated before the output of the two sensors are not compatible to each other. The sensor type needs to match the tailshaft, transmission harness, and PCM. Therefore, if a VSS wiring harness is mixed to a OSS style PCM, you can expect problems.

The only way I know how to tell the wiring harness difference is by comparing the wiring colors to the wiring diagrams.

Try researching extended range SpeedCal. However, I'm not sure it will work with a 1999+ MY. However using the correct sensor for your model year will give the greatest chance of success IMO.

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2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #11 of 21 (permalink) Old 07-14-2013 Thread Starter
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Yes I did read it, what I'm asking is how do I know if it is a t45 or t5 or 3650 or what trans it actually is? And the reason I'm confused is because yes it has the sensor with the gear on it, the other sensor( no gear just metal) was still able to fit in it just didn't fix the speedo, I had Midas install this one and did not see the original that came out to know if they installed the wrong sensor. I just want to know how I can identify this damn trans! I'm sorry I don't know **** about mustangs...
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The force is weak on this one. Hope lost it is. <Yoda speaking>

Suggestion. Take the speed sensor out and look inside the hole. What do you see? If you see spiral gears, then the transmission is expecting a VSS sensor.

If you see the reluctor teeth (same as the ABS sensor), then the transmission is set up for an OSS sensor.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #13 of 21 (permalink) Old 07-22-2013 Thread Starter
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Ok.. So does anyone know how I figure out which trans is supposed to be in the car? And how doin figure out if the one in it is original or has been changed?
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Is your question which manual transmission model is "supposed" to be in a 1998 V6 Mustang?

A 1998 V6 manual comes from the factory with a T5 configured for a VSS sensor.
A 1998 V8 manual comes from the factory with a T45 configured for a VSS sensor.
A 1998 V6 or V8 Automatic is the 4R70W configured for a VSS sensor.

Note, the V6 and V8 transmissions do NOT interchange (different bolt pattern).

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #15 of 21 (permalink) Old 07-25-2013 Thread Starter
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No, I have a 2000... My question is which manual trans is it supposed to have and how do I identify which one is in it now? I don't know if it has been changed or not.. Idk why someone said somethin about a 98. I know they changed from 94-98 and 99-04. I understand try have different transmissions. I just have no idea how to know if someone put an older trans in mine or if it's got the wrong sensor in it...
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