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

700R4 and speedo correction

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Old Aug 16, 2005 | 05:50 PM
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Default 700R4 and speedo correction

What is the correction gears for the drive gear and the driven gear on a 91 auto. I know that on a 6 speed its a grey 15 teeth gear and a purple 42 teeth gear.Is it the same for a auto tranny.
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Old Aug 16, 2005 | 06:45 PM
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Originally Posted by 91superram
What is the correction gears for the drive gear and the driven gear on a 91 auto.
What needs correction??? Why?

Originally Posted by 91superram
I know that on a 6 speed its a grey 15 teeth gear and a purple 42 teeth gear.
Is that so? First, the 42 tooth driven gear is green. The purple gear is a 43 tooth driven gear. The correct speedo gears depend on several items, besides the year and the trans. The tire size and gear ratio are equally important.

RACE ON!!!
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Old Aug 16, 2005 | 07:24 PM
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Don't I know! Learned something new about speedo sensors everyday since last week!
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Old Aug 16, 2005 | 07:47 PM
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It's a 91 with a 700R4 tranny
upgraded to 3:54 gears
Tire's 275/40/17
Stock drive gear is red 17 tooth
Stock driven gear is white 36 tooth

My question is to correct my MPH reading do I have to go with a gray 15 tooth drive gear and a purple 43 tooth driven gear can someone confirm this for me, and is the part# for a gray drive gear for a 700R4 (8642620)

Last edited by 91superram; Aug 16, 2005 at 07:50 PM.
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Old Aug 16, 2005 | 08:46 PM
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I see you have changed from 2.59 gears.

Originally Posted by 91superram
My question is to correct my MPH reading do I have to go with a gray 15 tooth drive gear and a purple 43 tooth driven gear can someone confirm this for me, and is the part# for a gray drive gear for a 700R4 (8642620)
That is correct. The driven gear is 25513050. You will also need a 10456092 VSS.

RACE ON!!!
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Old Aug 16, 2005 | 09:08 PM
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Thanks

CFI-EFI
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