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  Mustangsandmore Forum Archive
  '79 to '93 -- The Fox Mustang
  Speedo Gears

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Author Topic:   Speedo Gears
Velocity0
Gearhead

Posts: 330
From: Burnaby, BC Canada
Registered: Apr 2001

posted 06-12-2001 01:51 AM     Click Here to See the Profile for Velocity0        Reply w/Quote
can anyone tell me the "legend" for all the Speedo Gear Colors?

Right now I have a Kinda Cream Coloured..Yellow one.


I'm going to be switching my Rear end and Tranny, so I need to know what gear to get.

It'll be a stock T-5 Tranny but I don't know what gearing the rear end will be.

Gearhead
Gearhead

Posts: 2177
From: Brisbane, Australia
Registered: Mar 2000

posted 06-12-2001 11:58 AM     Click Here to See the Profile for Gearhead        Reply w/Quote
Here is the chart for the manual tranny driven gears:

Color # of Teeth Service Part #
----- ---------- --------------
Wine____16________C0DZ-A
White___17________C3DZ-C
Yellow__18________C0DD-B
Pink____19________C0DZ-B
Black___20________C1DZ-A
Red____21________C4OZ-A

Here is the formula for calculating the correct driven gear needed:

Driven Gear Teeth = (Drive Gear Teeth x Axle Ratio x Tire Rev. per Mile) / 1000

1983 to 89 T-5 trannys use a 7 tooth drive gear, and 1990-95 T-5s use an 8 tooth drive gear.

A 225/60R15 tire rates at about 815 revolutions per mile. My 235/60R15s come in at 797 revs per mile.

For my combo the calcualtion would be (with my 1990 T-5 and 3.08 gears):

(8 x 3.08 x 797) / 1000 = 19.64 (round up to 20), so I need a black driven gear.

Hope that this helps a bit!

------------------
Cheers,
Ian
M&M Member #395
-------------------
'79 Mustang Indy 500 Pace Car
Ian's Pace Car Website
Vancouver Island Mustang Association Website
Indy Pace Car Registry of Mustangs Official Website

"If you get to thinking you are someone of some importance and influence, just try ordering another persons dog around." - Author Unknown

[This message has been edited by Gearhead (edited 06-13-2001).]

GTRocks
Gearhead

Posts: 4800
From: Lusby, MD
Registered: Jun 99

posted 06-13-2001 12:09 PM     Click Here to See the Profile for GTRocks        Reply w/Quote
How many drive tooth gears does a C-4 have?

I am just putting 215/60/15s on my '66, and it has a C-4. What will I need to do?

Gearhead
Gearhead

Posts: 2177
From: Brisbane, Australia
Registered: Mar 2000

posted 06-13-2001 01:25 PM     Click Here to See the Profile for Gearhead        Reply w/Quote
It would be either 7 or 8 teeth, but I don't have specific information to identify which. You will probably have to either count them yourself or just get a couple of driven gears and experiment (the gears are pretty cheap).

Here's what the 2001 Ford Racing Performance Parts catalog says:

"The drive gear on rear wheel automatic transmissions is machined into the output shaft. Changing the "drive gear" in impractical since it requires a new output shaft and transmission teardown. Most have 7 or 8 teeth."

They do offer automatic tranmission specific "driven gears", and I assume that the formula to calculate the gear that you need would be the same as the one I put in the previous post. Here is the list of automatic driven gears (color and # of teeth):

Color # of Teeth Service Part #
----- ---------- --------------
Blue_____16_________D0AZ-A (discontinued)
Green____17_________C7SZ-A
Gray_____18_________C7SZ-B (discontinued)
Tan_____19_________C7VY-A
Orange___20_________C8SZ-B
Purple____21_________D0OZ-B

A 215/60R15 tire rates at 825 revolutions per mile.

Cheers,
Ian

[This message has been edited by Gearhead (edited 06-13-2001).]

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