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Old 10-05-2011, 08:13 PM
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Way to adapt speedometer after changing from 3.73 to 4.56

I have an 85 Monte Carlo SS with a 200r4 and a factory 3.73 7.5 rear. With the 327 I have for motor I want to go to a 4.56 rear. What I'm wondering is there an adapter or something that I can make the speedometer be accurate with the 4.56 or should I find one of those radar activated speed signs that the cops like to put out and memorize where the tach is at the speeds I care about. Its nice to know these things when the radar detector is lighting up. The car has an autometer sport comp speedo if that matters at all.

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Old 10-05-2011, 08:22 PM
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Just go in to your local Chevy dealer, tell them what transmission you have, the existing gear ratio and the proposed gear ratio and they will sell you a new plastic gear that fits in the transmission that connects to the speedo cable. Just that simple!
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Old 10-05-2011, 08:28 PM
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Thanks I really do appreciate the advise I get here.
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Old 10-05-2011, 08:45 PM
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GM dealer may not have any 200-4r speed-O parts.

Look here this page , down about 3/4 towards the bottom the page is speed-O parts - gears
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Old 10-06-2011, 03:34 AM
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2004R gears are getting scarce. May have to use a Ratio Adapter if you can't get the gears needed,

http://www.transmissioncenter.net/sp...n_______va.htm

Gears:
http://www.transmissioncenter.net/sp...____va.htm#200
http://www.tciauto.com/tc/transmissi...al-motors.html

Ratio Adapter:
http://www.transmissioncenter.net/sp..._____va.htm#gm ratio adapter
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