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Transmission speed sensor not reading accurately

Tiny
MYDUDEY14
  • MEMBER
  • 2003 FORD MUSTANG
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
I replaced my transmission on my car listed above. Since replacing the transmission the speed sensor when connected is reading 120 when i'm actually going 20.
Monday, November 2nd, 2020 AT 12:41 PM

11 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

What year and model did your donor transmission come from?

I attached a picture of the speed sensor for you. If the transmission is different from the original, it will not read correctly. The sensor goes over a tone wheel inside the transmission to produce the signal for speed. If that tone ring is different, this is the result.

Roy
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Monday, November 2nd, 2020 AT 1:22 PM
Tiny
MYDUDEY14
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Thank you,
The replacement transmission came from a 2004 Ford mustang, is there a way to correct the problem?
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Monday, November 2nd, 2020 AT 2:29 PM
Tiny
MYDUDEY14
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  • 6 POSTS
I appreciate the help, would you be able to post the picture again but a full diagram so I can see the enitre wiring diagram?
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Monday, November 2nd, 2020 AT 2:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
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You would need to find a speedometer guy that can fit an adapter for you to get the correct speed. The only other way is to either get the correct transmission or replace the shell inside the transmission.

Roy
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Monday, November 2nd, 2020 AT 2:33 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is the largest I can make it without distorting it.

Roy
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Monday, November 2nd, 2020 AT 2:34 PM
Tiny
MYDUDEY14
  • MEMBER
  • 6 POSTS
I still have my original transmission, what do you mean by adapter? And where can I find someone who can assist me in this? Again I really appreciate you helping it has been weeks that we have been trying to figure this out.

What part of the original transmission is the shell located?
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Monday, November 2nd, 2020 AT 2:43 PM
Tiny
ASEMASTER6371
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It is internal. The transmission has to be disassembled to access the shell that holds the clutches and planetaries.

I attached a picture for you to view.

You need to do a Google search in your area for someone who does speedometer repairs.

Roy
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Monday, November 2nd, 2020 AT 2:47 PM
Tiny
MYDUDEY14
  • MEMBER
  • 6 POSTS
What is a adapter? Also I would need to get a 2203 transmission right?
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Monday, November 2nd, 2020 AT 3:07 PM
Tiny
MYDUDEY14
  • MEMBER
  • 6 POSTS
2003 Mustang transmission will be the correct one?
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Monday, November 2nd, 2020 AT 3:08 PM
Tiny
ASEMASTER6371
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Yes, did you get a 4R70 or 4R100?

Roy
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Monday, November 2nd, 2020 AT 3:17 PM
Tiny
ASEMASTER6371
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I attached some possibilities for you to view. The site www. Car-part. Com is very good.

Roy
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Monday, November 2nd, 2020 AT 3:20 PM

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