Calibrating the speedometer - F150online Forums


Calibrating the speedometer

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  #1  
Old 08-04-2005, 01:44 PM
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Question Calibrating the speedometer

How do you calibrate the speedometer on a F-150 that has no gear on the tail shaft housing of the tranny?

I just have a plate on the side on the tail shaft housing of the tranny to cover up the hole were one would go.

All of my speed Info for the PCM(EEC), speedometer, odometer, Speed control and RABS comes from the VSS sensor on the top center of my rear end housing.

All of my 1995 Truck wiring diagrams and manuals support this but gives no clue on calibrating the speedometer.

Do you replace the Speed Sensor Ring in the rear end with a different one?



Here is what the Service Manual from FORD says.



Last edited by subford; 08-04-2005 at 03:48 PM. Reason: ADD INFO
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Old 08-04-2005, 05:49 PM
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Found the answer on a nother post.

THIS IS ALL WRONG

If your VSS is attached to the top of the diff then it can be adjusted electronically with a tuner. If the VSS is attached to the tranny or transfer case then it cannot be adjusted with a tuner. You can adjust it mechanically with gears (Tyre Match Box) or electronically by hardwiring in a chip (Yellow Box or Truspeed)

Last edited by subford; 08-06-2005 at 11:41 AM. Reason: error
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Old 08-04-2005, 09:50 PM
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my superchips tuner does it for me the dealer can also do it but they make u pay too much... and from what i have heard they dont have too much a of a range of tire sizes on their machine. if it were me and i had the money invest it in a tuner, not only can u check codes, do tire and axle ratios, but also can gain some performance
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Old 08-06-2005, 11:44 AM
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Post Here is How to Do IT

It was in the manual.







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Old 08-16-2005, 12:58 PM
 
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Will this same procedure work on a 2001 F150 for a rear-end gear swap? Can I follow these instructions to calibrate my speedo after I install 4.10's?
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Old 08-16-2005, 02:00 PM
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The procedure is for 1992 or 3 - 1996 f-150. I do not know for sure but I think they went back to changing the little gear in the tyranny tail shaft in 1997 and up, its not as hard to do.
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Old 08-16-2005, 02:12 PM
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sorry

Last edited by subford; 08-16-2005 at 02:13 PM. Reason: Sorry wrong post
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Old 08-18-2005, 01:37 PM
 
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Quote:
Originally Posted by subford
The procedure is for 1992 or 3 - 1996 f-150. I do not know for sure but I think they went back to changing the little gear in the tyranny tail shaft in 1997 and up, its not as hard to do.
Do you know how much those little gears are? Seems like I heard they're like $15 or $20 bucks.
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