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  '64 1/2 to '73 -- The Classic Mustang
  Driven gear

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Author Topic:   Driven gear
Harley
Gearhead

Posts: 131
From:
Registered: Jul 99

posted 08-21-2001 03:39 AM     Click Here to See the Profile for Harley     Edit/Delete Message   Reply w/Quote
I'm putting in a new speedometer cable and need a new driven gear, but don't know what size (or number of teeth) I need.

There's a formula in the National Parts Depot catalog that says to take the number of drive gear teeth and multiply by the axle ratio, then multiply that by the tire revolutions per mile, then divide it all by 1,000.

My axle ratio is 3.00:1, but I have no idea the number of drive gear teeth, or tire revolutions per mile (they're 15-inch).

Can anybody steer me in the right direction?

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Scott302
Journeyman

Posts: 30
From: Livonia, MI, USA
Registered: Mar 2001

posted 08-21-2001 08:58 AM     Click Here to See the Profile for Scott302     Edit/Delete Message   Reply w/Quote
Tirerack.com lists specs for the tires they sell including the OD of the tire and in many cases the manufacturers specs for tire rev's per mile. If you have non-original tires they propably have your tire listed somewhere.

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Scott Halseth
National Parts Depot
65 Convt
66 Coupe

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Harley
Gearhead

Posts: 131
From:
Registered: Jul 99

posted 08-21-2001 11:16 PM     Click Here to See the Profile for Harley     Edit/Delete Message   Reply w/Quote
Thanks. That gave me what I needed to know about the tires. Now, what about the number of drive gear teeth?

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 08-22-2001 06:42 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Harley, this will help:

https://mustangsandmore.com/ubb/Forum1/HTML/004404.html

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!

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Harley
Gearhead

Posts: 131
From:
Registered: Jul 99

posted 08-24-2001 12:43 PM     Click Here to See the Profile for Harley     Edit/Delete Message   Reply w/Quote
Thanks for your help, but I'm still lacking the one important number I need to use the formula: the number of drive gear teeth.

Everyone tells me I can determine this by counting the number of teeth on the driven gear, but that's my whole problem. The driven gear is missing; that's the part I need to replace.

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SteveLaRiviere
Administrator

Posts: 42859
From: Saco, Maine
Registered: May 99

posted 08-26-2001 06:45 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
In that case, you'll need to take off your tailshaft housing and count the teeth.

------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
Ford. The closer you look, the better WE look!

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