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Old 02-12-2015, 10:44 AM   #1
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Speedometer

Does anyone know how the speedo gets it's info? Mine reads about 8-10 mph faster than the gps. Trans is a allison 3060.
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Old 02-12-2015, 10:51 AM   #2
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Is it a mechanical or electronic speedometer? Tire size will throw them off.
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Old 02-12-2015, 02:14 PM   #3
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Is it a mechanical or electronic speedometer? Tire size will throw them off.
The tire size is the same exact size that is listed on the sticker with the weights although a different brand. I didn't look at the back of speedo. If it's mechanical there be a cable going to it and electronic wired?
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Old 02-12-2015, 05:08 PM   #4
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Mechanical will have a cable coming from the transmission or a wheel-most often the front wheel-as well as the back of the speedometer. Now GPS is not a solid way to check speed with. Use a "measured mile" and a watch. Or go to a speedometer shop.
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Old 02-12-2015, 05:57 PM   #5
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Mechanical will have a cable coming from the transmission or a wheel-most often the front wheel-as well as the back of the speedometer. Now GPS is not a solid way to check speed with. Use a "measured mile" and a watch. Or go to a speedometer shop.
You can tell it's off plus wife had to follow in the car after I lost a pin for the tow bar and couldn't get another. Thankfully we were only a hour from home.
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Old 02-12-2015, 06:03 PM   #6
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You can tell it's off plus wife had to follow in the car after I lost a pin for the tow bar and couldn't get another. Thankfully we were only a hour from home.
Hows about a bet for 100 bucks that you have a extra now
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Old 02-12-2015, 06:24 PM   #7
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Has it always been high or is this something new?
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Old 02-12-2015, 06:52 PM   #8
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Has it always been high or is this something new?
I purchased it this way. I have only had it sence late August.
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Old 02-12-2015, 07:59 PM   #9
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At this point I would look for were the cable or speed sensor is mounted-transmission or wheel. At the end of the cable/sensor that is inside the trans/wheel there should be a gear. check the gears number of teeth to make sure you have the right gear (there are charts for this). If you do have the right gear I would think the problem is in the speedometer its self or maybe the engine/chassis computer that sends signals to the speedometer. At which point I think its shop time-speedometer shop that is.
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Old 02-12-2015, 08:33 PM   #10
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When you turn on the ignition key, does the needle swing up then back down again? If so, it's an electronic speedo controlled by the ECU. A speedometer shop should be able to help.
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Old 02-13-2015, 12:58 AM   #11
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I thought there were different speed gears that went into the transmission for different rear axle ratios .
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Old 02-13-2015, 07:21 AM   #12
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There are a couple of differnet speedometer systems.

Older vehicles a gear on the output end of the transmission or gear splitter, is turned by a worm gear on the shaft itself, This gear turns a cable which in turn turns the input shaft on the speedometer,,, I won't go into how those work but again there are a couple of diferent ways.

In this case a Speedometer shop may be able to help you.

Next is an electronic system, In this case a Hall Effect Sensor reads the passage of bars (like the teeth of a gear) attached to the same point as the worm gear above,, This is a very very very highly accurate system when it comes to reading revolutions of the shaft. There may be different collars for the shaft however.

The signals generated by the Hall Effect Sensor feed a computer and the speedo is basically the computer monitor (Even if it is an analog mechanical meter it is the comptuer's monitor the needle is a servo, controlled by the computer)

In this case.. the Speedo shop simply flashes the comptuer with a corrected program and you are good.
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Old 02-13-2015, 01:21 PM   #13
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When you turn on the ignition key, does the needle swing up then back down again? If so, it's an electronic speedo controlled by the ECU. A speedometer shop should be able to help.

Well I just hiked out to the motorhome in the backyard in waist deep snow. Flipped on the battery disconnect turned key and the speedo does move up 1/8 inch and drop back down. Sooo I guess it's electronic. I read somewhere that if it's electronic it could be some sort of sensor that needs to be changed on the trans?
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Old 02-13-2015, 01:31 PM   #14
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Usually when the Hall effect sensor is bad, replacing it can repair speedo. The fact that yours just reads wrong is usually programming, not a bad sensor.
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