Classic Mustangs List Archive

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Mail From: (email redacted) ((email redacted))

hello all,

does the ring gear ( 8" ) of a 2.80 ratio have the same number of teeth
as a ring gear with a 3:25 ratio?

my 66 coupe is supposed to have a 2:80 gear (axle code on door tag is
6). i am refurbishing the rear end and have another hog head with 3:25 gears.

when i use the method of turning the pinion and counting the revolutions of
the ring gear, both hog heads come out the same -- 3.25 turns per one turn of
the ring gear. i counted the teeth on both ring gears and both have 39 teeth.

i have the ratio tag from my extra hog head and it does indeed say 3:25
. the rear end i pulled out of the car (original???) does not have a tag on
it. Maybe a previous owner has swapped the hog heads before and i already
have a 3:25 ratio?

the car has a c4 trans if it helps...trans code on door tag is
also 6, so i know that is correct

any ideas?? i am completely stumped now.....

thanks in advance....

Jason
'66 coupe
New Albany , IN

This read-only message was archived from a public mail list.
Mail From: (email redacted) (Sexsmith, Scott)

Jason,

If you have a shop manual it gives you the number of teeth on each gear.
I'm at work and don't have it here. If you don't get an answer from someone
soon I'll see if I can't figure it out.

I'm putting 3.25's in my 9" and pulling the 2.80's this winter...

Scott

-----Original Message-----
From: (email redacted) [mailtoemail redacted)]
Sent: Wednesday, November 20, 2002 2:57 PM
To: (email redacted)
Subject: [CM] gear question


hello all,

does the ring gear ( 8" ) of a 2.80 ratio have the same number of teeth

as a ring gear with a 3:25 ratio?

my 66 coupe is supposed to have a 2:80 gear (axle code on door tag is
6). i am refurbishing the rear end and have another hog head with 3:25
gears.

when i use the method of turning the pinion and counting the revolutions of
the ring gear, both hog heads come out the same -- 3.25 turns per one turn
of
the ring gear. i counted the teeth on both ring gears and both have 39
teeth.

i have the ratio tag from my extra hog head and it does indeed say
3:25
. the rear end i pulled out of the car (original???) does not have a tag on
it. Maybe a previous owner has swapped the hog heads before and i already
have a 3:25 ratio?

the car has a c4 trans if it helps...trans code on door tag is
also 6, so i know that is correct

any ideas?? i am completely stumped now.....

thanks in advance....

Jason
'66 coupe
New Albany , IN
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This read-only message was archived from a public mail list.
Mail From: (email redacted) (Walt Boeninger)


(email redacted) wrote:
>
> hello all,
>
> does the ring gear ( 8" ) of a 2.80 ratio have the same number of teeth
> as a ring gear with a 3:25 ratio?

Probably not.

> my 66 coupe is supposed to have a 2:80 gear (axle code on door tag is
> 6). i am refurbishing the rear end and have another hog head with 3:25 gears.
>
> when i use the method of turning the pinion and counting the revolutions of
> the ring gear, both hog heads come out the same -- 3.25 turns per one turn of
> the ring gear. i counted the teeth on both ring gears and both have 39 teeth.

Then they are both 3.25 If the ring gear has 39 teeth, the pinion has 12
for a 3.25 ratio (39/3.25 = 12) You can't get 2.80 with a 39 tooth ring gear
because 39/2.8 = 13.93 . So what gears would give a 2.80 ratio?
The only possible combos I see are 28/10 or 42/15.. I'd guess 28/10.

> i have the ratio tag from my extra hog head and it does indeed say 3:25
> . the rear end i pulled out of the car (original???) does not have a tag on
> it. Maybe a previous owner has swapped the hog heads before and i already
> have a 3:25 ratio?

I think so....

>
> any ideas?? i am completely stumped now.....

Empirical observation usually is more accurate than "supposed to have"!


------
Regards

Walt Boeninger - Nor Cal SAAC 67 GT500 | 67 Shelby T-A #31
norcal-saac.org 71 Boss 351 | 97 5.0 Explorer
mailtoemail redacted) 99 C5 Hdtp | 02 Mustang GT