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  Speedo gear selection help... quick!

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Author Topic:   Speedo gear selection help... quick!
V8 Thumper
Gearhead

Posts: 2807
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 04-01-2002 11:23 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
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

posted 04-01-2002 11:40 AM     Click Here to See the Profile for richard bohm   Click Here to Email richard bohm     Edit/Delete Message   Reply w/Quote
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

posted 04-01-2002 12:39 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
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

posted 04-01-2002 12:59 PM     Click Here to See the Profile for Hemikiller   Click Here to Email Hemikiller     Edit/Delete Message   Reply w/Quote
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

posted 04-04-2002 07:43 AM     Click Here to See the Profile for cpmaverick   Click Here to Email cpmaverick     Edit/Delete Message   Reply w/Quote
http://www.finer.com/Internet/pages/speedo.htm

It'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

posted 04-04-2002 10:07 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
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

posted 04-05-2002 09:58 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by cpmaverick:
http://www.finer.com/Internet/pages/speedo.htm

It'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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