Classic Instruments Speedometer sender.
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Fleet Mechanic
Joined: Sep 2010
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From: Mason City, Iowa
Classic Instruments Speedometer sender.
I have a friend building on a 55 F-100, but is using a 95 F-350 frame, and is making it a 4 wheel drive with a Dana 60 front and a Ford 10 1/4 inch rear end. He will be using an AOD transmission. He says his rear end has a hole in it for a Speedometer sensor, but for some reason, Tech Support at Classic Instruments can't tell him for sure if their Ford style pulse counter that works with their Speedo will fit and work with his 10 1/4 rear end. Can anyone tell me?
More Turbo
Joined: Nov 2004
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From: Marysville, WA
The sensor on that axle is likely a hall effect no contact sensor that sends out a pulse, The classic instrument ones I just looked at appear to be for mounting a gear and driving so I don't think they will work. If you tell them it is a hall effect sensor and how many wires they may be able to convert the signal with one of their boxes.
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Fleet Mechanic
Joined: Sep 2010
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From: Mason City, Iowa
The sensor on that axle is likely a hall effect no contact sensor that sends out a pulse, The classic instrument ones I just looked at appear to be for mounting a gear and driving so I don't think they will work. If you tell them it is a hall effect sensor and how many wires they may be able to convert the signal with one of their boxes.
That is my line of thinking too. I think you are correct about the Ford OEM sender being a hall effect unit. I know that you can't mix and match senders for electric temp or oil gauges and an aftermarket gauge has to have correct senders to work properly. But what I am wondering is since Classic makes a pulse counter, which I am guessing is also a hall effect unit, if in this case he could use the O.E. Ford counter in the differential, and then correct the electronic calibration in the speedometer? Its basically doing the same job, but the wild card would be the pulses per mile.
More Turbo
Joined: Nov 2004
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From: Marysville, WA
He may be able to, you could ask classic instruments, tell them its a hall effect and how many teeth are on the wheel and they should be able to tell you if it is in the calibration range of the gauge cluster, and if they can read it at all! If it is out of range they have an amplifier box. I got their classic looking gauge for my F250 and its awesome, I had problems with it not reading the speedometer signal but I was able to read the output from my PCM so it worked out in the end!
More Turbo
Joined: Nov 2004
Posts: 555
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From: Marysville, WA
I think at first that axle sensor was only used for ABS but later used as the vehicle speed sensor, many modern cars use ABS sensors for speed because its there and they don't have to add another sensor to the transmission. Looking at the 5 speed manuals Ford used I would estimate they started using the axle sensor as the speed sensor in 1999, Maybe the same for the AOD?
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Fleet Mechanic
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From: Mason City, Iowa
Thanks to Jules and Ross for the replies. I was doing some research today and downloaded the actual manual from Classic Instruments and when it comes to connecting up the Speedometer it gives you the option of connecting a Pulse Signal Generator, or a Vehicle Speed Sensor (VSS ) to the purple Speed Signal wire. So it appears he could of used the VSS installed in the differential and then calibrated it for the correct speed when done. As it turns out, he has now decided to go another direction, stick with the stock speedo with an electronic to mechanical converter box. Probably using the VSS in the differential to drive the converter box.
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