[Chevelle-list] Mis-matched Speedometer Gear and Rear End Ratio

[Dale]

Try http://chevelleengineer.home.comcast.net/speedo.htm for some very good
information on speedometer gear selections.  Never heard of a 3.49 gear
ratio but 3.31s were standard I believe.  Check
http://www.chevellestuff.com/generic/axlecodes.htm near the bottom of the
page for Chevrolet gear sets.

 

Dale McIntosh

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ChevelleStuff.com <http://www.chevellestuff.com> 

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From: chevelle-list-bounces at chevelles.net
[mailto:chevelle-list-bounces at chevelles.net] On Behalf Of richard sierra
Sent: Thursday, October 11, 2007 10:02 PM
To: The Chevelle Mailing List
Subject: Re: [Chevelle-list] Mis-matched Speedometer Gear and Rear End Ratio

 

 
Hello Again -
 
I have a problem and would like to pick your collective knowledge - I have a
'70 SS 396 which has I'm told a posi rear with a 3.49 gears - The problem is
when I'm driving my speedometer indicates a high speed than I'm actual doing
by 10mph - When my mechanic pulled out the speedometer gear he found that it
had 39 teeth - So I ordered a few different gear with more teeth - The
problem I have now is the diameter of the existing 39 tooth gear is 1 7/16"
and the replacement gears are 1 3/4" - In addition, they will not fix inside
of the existing housing - The housing is stamped 36-37-38-39 which I assume
is the different gears it will accept - An suggestions on how I can get my
speedometer to give me a more accurate speed reading would be appreciated -
Rich
 
PS I've read that the only gears offered for my year were 3.31 so my
mechanic could be off in his  

 

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