Gear ratio 9" Ford

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Oct 12, 2006 | 09:07 PM

imlowr2

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From: Santa Clarita

Gear ratio 9" Ford

I'm curious what the gearing of choice of everyone in here is?. I have a 9" ford and am running 3.50 gears.

Last edited by imlowr2; Oct 12, 2006 at 09:10 PM.

Oct 12, 2006 | 09:38 PM

AXracer

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From: Durham NC

I have 3.70 but also double overdrive 0.50 6th.

Oct 12, 2006 | 11:22 PM

53fatfndr

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From: Earth

I'm running 3.50 gears in my 9" as well.

Oct 12, 2006 | 11:40 PM

Randy Jack

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From: Riverside, So Cal

I'm running 3.50 as well.

Oct 12, 2006 | 11:57 PM

imlowr2

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From: Santa Clarita

53 and Randy- Do you guys have overdrive? and what are you taching on the freeway. I'm taching about 2500 @60 miles per hour. Thanks guys.

Oct 13, 2006 | 03:18 AM

Col Flashman

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From: La Verne, California

The original 3.70 that came w/ the original 9".

Oct 13, 2006 | 06:37 AM

joe hoffman

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From: Longwood, fl

Ed,
Swapped from a 3.50 to a 3.00

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Oct 13, 2006 | 07:07 AM

pickup_289

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I have a 4.30 posi in mine.

Oct 13, 2006 | 07:49 AM

#10

49willard

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From: Harpswell Maine

Not back on the road but I have a 3.70 with a .67 AOD.

Oct 13, 2006 | 08:11 AM

#11

merc546

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From: Michigan

Ok, I just checked it out on one of these on line calculator programs and the results are, 27.8 tire (P23/70R15), 3:50 final drive ratio and a .67 trans ratio @ 2000 rpm I'm traveling at 70.57 mph.

Chuck

Oct 13, 2006 | 08:54 AM

#12

Randy Jack

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From: Riverside, So Cal

Ed -

I don't ever travel at 60 mph. But I tach 3200 at 70!

I plan on an AOD someday, to improve mileage. But I sure like the grunt I get off the line from that 3.50 posi!

Oct 13, 2006 | 10:38 AM

#13

Jag Red 54

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Joined: Oct 2002

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From: Valley Center, CA

I changed out my 3.50s to 3.00s thanks to Daryl and Butch. Nice cruising rpms. Jag

Oct 13, 2006 | 11:28 AM

#14

AXracer

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From: Durham NC

In 6th @ 2000 RPM I'm doing a even 90 MPH! It's just at a high idle @ 70. Don't even need to put my foot on the pedal @ 55!

Oct 13, 2006 | 11:53 AM

#15

GreatNorthWoods

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From: Littleton, New Hampshire

I sure will be glad when I get mine out on the highway to find out what my cruzin' RPM will be. I'm running a very tall rear gear (2:26) and 225/75 R15s but no OD transmission. My guess is somewhere around 1800-2000 RPM at 70.