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Old 06-23-2014, 07:55 AM   #1
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Speedometer quit

Stopped functioning,

Where should I investigate.
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Old 06-23-2014, 12:15 PM   #2
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I'm assuming you have a 94-98 car from your avatar. If you have a 99-04 or a trans out of a 99-04 then you don't have VSS.

Well first take a peek at the VSS gear on the VSS sensor in the tailshaft of the trans. It is easy to get to and is a 8mm bolt IIRC on the left side of the tailshaft. Removing it will not leak any fluid so don't worry about that. You are inspecting the gear on the sensor and also shining a light in the hole and making sure the teeth on the driven gear are there.

If all that is kosher you can check to see if you have any broken wires or if you are running a speedometer recalibrator box you can try bypassing it to see if it is the problem. Finally, there is the speedometer itself. These are electronic speedometers and the motors are known to fail in them, would not be the first time. The good news is a cluster is a 15 minute swap, the bad news is that PATS may hate you if you are a 96-98. I've you've got a tuner you can just have PATS disabled though.
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Old 06-23-2014, 05:27 PM   #3
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Its a 95gt with a 93gt rebuilt motor and a tremec t56 tranny,
Same idea for this tranny?


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Old 06-23-2014, 07:28 PM   #4
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As long as the T-56 came with a VSS sensor provision. Did your speedo just quit randomly or was it when you did something else?
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Old 06-24-2014, 04:51 AM   #5
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The speedo was working when I got her out this season. Then just quit.

Swapped motor over winter,
Tranny got played with.


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Old 06-24-2014, 07:08 AM   #6
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The motor has nothing to do with the speedometer, it is all handled by the ECU in 94-up vehicles. The transmission might be if you swapped in a OSS T-56 into your car but the speedo itself should still at least move if that's the case.
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Old 06-24-2014, 09:06 AM   #7
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I see,
Well the needle doesnt move at all anymore,

Ill inspect the gear on the sensor.

Maybe it the actual cluster like you said.

Anyhow, thanks scotty


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Old 06-24-2014, 09:57 AM   #8
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To check the cluster get someone to watch the spedo wile you spin the gear or cable manually. Can use a cordless drill on the cable and if I remember right the drill has to be in reverse. Preferably a variable speed drill.
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Old 06-24-2014, 05:21 PM   #9
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Ignition would have to be on to test with a drill. I forget which way it has to go as well. If he used that stupid white gear in the trans it could have gotten eaten up too. Or the speedo just died. Its more common than ppl think.
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