C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Speedo Calibration

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Old Mar 25, 2008 | 01:20 PM
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Default Speedo Calibration

What is the best source to find the speed correction gears for the ZF6 going from the 3.45's to the 4.11's?
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Old Mar 25, 2008 | 01:58 PM
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This is the only source I am aware of in that ratio, and they are pricey.

http://www.zr1specialist.com/HAT%20W...on%20Gears.htm

But you may not need gears at all in a 96, I think the calibration can be changed in the PCM by a tuner.
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Old Mar 25, 2008 | 05:23 PM
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Default Alright.....

Originally Posted by toptechx6
This is the only source I am aware of in that ratio, and they are pricey.

http://www.zr1specialist.com/HAT%20W...on%20Gears.htm

But you may not need gears at all in a 96, I think the calibration can be changed in the PCM by a tuner.

Now that's a thought. The car already has a tune that was performed about 3 years ago. I wonder what it will run to have the PCM upgraded by just this one upgrade
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Old Mar 25, 2008 | 05:31 PM
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Originally Posted by GS348
Now that's a thought. The car already has a tune that was performed about 3 years ago. I wonder what it will run to have the PCM upgraded by just this one upgrade
If you can contact the original tuner they will often do an update for less than the price of the original tune, good luck, let us know how you make out.
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Old Mar 25, 2008 | 05:53 PM
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Correct, just do it in the tune. It's a very easy fix.

If you had an OBDI car I could help you out but I don't have the software for a 96' (my car was converted to OBDI).
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