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Old 05-21-2012, 09:32 PM
Dana E. Dana E. is offline
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Join Date: Dec 2004
Location: Hillsboro, OR
Cobra Make, Engine: Superformance SPO2512 427W TKO 600/ NW Exotics 351 Cleveland/Tremec 3550-Sold
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I think you are going to find the problem is in the Smiths speedometer itself.

If it was the gear, the difference in indicated speed versus actual speed would be off the same amount whether you were traveling at 20 MPH or 50 MPH.

If the speedometer needle bounces around, that would most likely be a problem with the cable.

When i first got my SPF, the speedometer reading was within a couple of MPH of the true GPS speed. Within 200 miles, the speedo started failing. It reads fairly accurately to about 25-30 MPH, then will hang at 35 MPH, and usually indicates 50 MPH when you are traveling at 75-80 MPH.

I'm having the local speedometer repair shop looking at my speedometer this week to see what the problem is.
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