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Topic: Speedometer gear

in Forum: C3 Driveline Components


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Speedometer gear (1/4)
 8/30/12 3:40pm
dapperdan
Former Member

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COLUMBUS, NC - USA

Vette(s):
2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed


Joined: 8/19/2012
Posts: 42

I'm gonna change the differential from a 3.70 to a 3.36 on my '77 L-82 4-speed.  It's gonna need a different speed-o gear.  I assume that it will be a smaller gear than what's in the tranny now.  Does anyone know which one will get my speed-o back to accurate after the gear change?

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Re: Speedometer gear (2/4)
 8/30/12 8:01pm
corvette440hpLifetime Member
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Joined: 7/2/2006
Posts: 8205



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corvette440hp
Re: Speedometer gear (3/4)
 8/30/12 8:04pm
corvette440hpLifetime Member
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Joined: 7/2/2006
Posts: 8205

From the above chart you'll need the 18 tooth (#3987918) brown gear.

|UPDATED|8/30/2012 5:04:11 PM (AZT)|/UPDATED|


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corvette440hp
Re: Speedometer gear (4/4)
 9/1/12 7:36pm
dapperdan
Former Member

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COLUMBUS, NC - USA

Vette(s):
2011 Grand Sport Coupe, 6-speed 1977 Coupe L82, 4-speed


Joined: 8/19/2012
Posts: 42

Thank you very much.   That's gonna save me a lot of trouble.

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