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Classic Mustangs Talk General Discussions

General discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustangs. Discuss all non-technical topics related Vintage Mustangs here.

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Unread 06-18-2010   #1 (permalink)
baballard62 is offline Apprentice

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Default what axle gear ratio is the best for me?

I have a 1967 mustang that i'm putting a 390 in with a C6 transmission. I'm in the process of ordering a 9" rear end from Moser engineering and when it comes to the gear ratio i want to order i don't know what to do.
I don't want to drag race the car but i do want it to be pretty fast for a street rod or something. Since it won't be a daily driver i don't really care much about the gas mileage. Any help?
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Unread 06-18-2010   #2 (permalink)
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Sounds like a nice car

Just my opinion, with the 390 (gobs of torque) and the C6 (no overdrive),
I would stay around a 3.5 for a cruiser. You'll probably still fry the
tires when you jump on it.
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Unread 06-18-2010   #3 (permalink)
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If you plan to drive any distance at >60mph on the hwy. I'd stay <3.55:1 as stated by TRT, the RPM's really start to climb and stay there when cruising >60mph on the hwy and stress/heat the engine more than I'd be comfortable with not to mention the sound of the engine screaming more just to get down the road. Less snap off the line but more bearable on the hwy. would be 3.25:1.

Here's a handy calc., plug in your tire ht., gear ratio, etc. and it'll figure what your RPM's will be at any speed in top gear (1:1 3rd gear in a C6). I made a spreadsheet to see what changing gears and speeds would do to the RPM's until I found a happy medium.
Randy's Ring & Pinion. RPM Calculator.

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Unread 06-18-2010   #4 (permalink)
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The C6 does have overdrive
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Unread 06-19-2010   #5 (permalink)
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Quote:
Originally Posted by baballard62 View Post
The C6 does have overdrive
I'm all ears, please explain to me how the C6 has an overdrive?
It has 3 speeds and reverse, the gear ratios are:
2.18:1 reverse
2.46:1 1st gear
1.46:1 2nd gear

1.00:1 3rd gear

A 1:1 gear ratio is not overdrive, overdrive is lower than 1:1 such as and AOD where the 4th gear is 0.67:1 thereby dropping the RPMs when it shifts into this 'overdrive' gear that is basically the definition of overdrive.
Please explain how your C6 has an overdrive?
Jon

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Unread 06-20-2010   #6 (permalink)
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My bad it doesn't. Sorry I'm new to this.
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Unread 06-20-2010   #7 (permalink)
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That's ok, you sparked my interest, I began guessing that maybe in a later year they made one but then I'm sure they'd call it a different number to seperate them.

We're all here to learn, ask and answer questions. I think I learn something new everyday I read a forum and these cars are 40+ yrs. old. I always think, what else can there be? Then I read something new.

If you play with that calculator I posted it'll give you a good idea of how many 100's the RPM's jump up with each size rear gear -stock 2.79 to 3.25 to 3.55 to 3.73:1, etc.
Jon
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'09 Black Warriors In Pink with glass roof - the wifes Mustang.
"If it ain't broke, I haven't fixed it yet" -Jon
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