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Author
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Topic: Speedo gear selection help... quick!
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V8 Thumper
Gearhead Posts: 2807
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 04-01-2002 11:23 AM
   
Four speed trans, 3.70:1 r/p ratio, 26" tall street tires. The speedo gears available have teeth numbers of 16, 17, 18, 19, and 20. Which one do I need?
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richard bohm
Gearhead Posts: 373
From: tucson,az-luray,va
Registered: May 2001
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posted 04-01-2002 11:40 AM
off the top of my head i would say the 20 tooth gear is the one you need. npd has a speedo gear calculation formula in their catalog.
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V8 Thumper
Gearhead Posts: 2807
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 04-01-2002 12:39 PM
quote:
Originally posted by richard bohm:
npd has a speedo gear calculation formula in their catalog.
Anyone have the NPD catalog handy? I'm at the oriface right now, my catalog is at home 
Note: The drive gear on the output shaft has seven teeth. HELP!
[This message has been edited by V8 Thumper (edited 04-01-2002).]
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Hemikiller
Gearhead Posts: 256
From: Clinton, CT
Registered: Feb 2002
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posted 04-01-2002 12:59 PM
I came up with 20 as well using the formula, with a 7 tooth drive gear.........
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cpmaverick
Moderator Posts: 1501
From: Auburn, AL.
Registered: Jan 2000
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posted 04-04-2002 07:43 AM
http://www.finer.com/Internet/pages/speedo.htmIt's for T5s but teeth is teeth right?  ------------------
-Charlie Ping
1970 Maverick Grabber
[email protected] with AC and overdrive.
http://www.maverickgrabber.com
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kcode
Gearhead Posts: 2435
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99
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posted 04-04-2002 10:07 PM
I think most early toploaders had a pink 6 tooth drive gear. If in doubt, the teeth can be counted through the speedometer cable mounting hole.  Mike
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V8 Thumper
Gearhead Posts: 2807
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 04-05-2002 09:58 AM
quote:
Originally posted by cpmaverick:
http://www.finer.com/Internet/pages/speedo.htmIt's for T5s but teeth is teeth right?
Thanks! That's a  link...
You guys were right, 20 teeth on the driven gear. 
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