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Speedometer calibration after gear change

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Old Dec 25, 2010 | 09:18 AM
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Default Speedometer calibration after gear change

I understand it is not need for the C6.

I was asked why by a friend and I did not have a complete answer.

How does this correction work.

Merry Christmas to all.
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Old Dec 25, 2010 | 09:41 AM
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Originally Posted by Boomer111
I understand it is not need for the C6.

I was asked why by a friend and I did not have a complete answer.

How does this correction work.

Merry Christmas to all.
The speedometer sending unit is electronic. The sensor for the speedometer is in the ring gear, when you change ring gears you effectively change your speedometer. Doesn't work for tire size changes, just for differentials that have the sensor.
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Old Dec 25, 2010 | 09:59 AM
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Thanks, I'll see if this answers his question fully enough. It is good enough for me!!
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Old Dec 26, 2010 | 09:19 PM
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Originally Posted by haljensen
The speedometer sending unit is electronic. The sensor for the speedometer is in the ring gear, when you change ring gears you effectively change your speedometer. Doesn't work for tire size changes, just for differentials that have the sensor.
Someone posted that this is true for the manual transmission, but not the automatics.

No personal experience here.
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Old Dec 27, 2010 | 09:08 AM
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Originally Posted by Gearhead Jim
Someone posted that this is true for the manual transmission, but not the automatics.

No personal experience here.
Works for me I have a manual transmission.
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Old Dec 27, 2010 | 08:24 PM
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Originally Posted by Boomer111
Works for me I have a manual transmission.
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Old Dec 28, 2010 | 01:51 AM
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Automatics have to be reprogrammed. Manuals require no mods.
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Old Dec 28, 2010 | 08:53 AM
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Originally Posted by Paratrooper307
Automatics have to be reprogrammed. Manuals generally require no mods.
Fixed.

There have been a few of us that had an issue with the speedo being off by 5% after the swap. I had to use HPT to get my speedo accurate.
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