Gear ratio 9" Ford
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Click on the articles and specs tab at the top of the page. down the bottom is a link to automotive calculators. If you know the diameter of your tires (available on most tire manufacturers website or just measure one) and the gear ratio you can calculate the speed at any RPM or vice versa.
Cargo Master
Joined: May 2003
Posts: 2,561
Likes: 1
From: Earth
Originally Posted by imlowr2
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.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
I don't know which 9" I'm using yet. I have 3.50, 3.25, and 4.11 at my disposal. I believe the 3.25 would be good for anything w/no od, and the 3.50 for anything w/OD. I do know gas mileage at 55 mph in my 300 6/c6/fulltime 4wd 79 bronco w/31"ers is marginal at best, but go over 60 mph, and it drops off fast as the rpms jump. That's w/ 3.50 gears.
What I want is what AX has, but I'm too broke to buy a T56.
What I want is what AX has, but I'm too broke to buy a T56.
Postmaster
Joined: Apr 2000
Posts: 3,890
Likes: 9
From: La Verne, California
That's why I've been contemplating the 3.23 gearing I've setting in storage to go w/ the 300c.i.er averaging 14mpg, to replace the stock 3.70 that got me on average 25mpg w/ my 223c.i.er.
Last thing I need is to have my bad ankle, that likes to give out on me several times a day, to do that while using a clutch, that's why I went w/ the C-4 & M-o-M.
Last thing I need is to have my bad ankle, that likes to give out on me several times a day, to do that while using a clutch, that's why I went w/ the C-4 & M-o-M.
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Postmaster
Joined: Apr 2004
Posts: 3,005
Likes: 2
From: Santa Clarita
I just pulled the 3rd member on my truck and I'm running 3.00 in it with a regular C4 tranny. I just had a set of 3.50's built for me and am planning on putting them in. The 3.00's, with 28" tires, I'm taching about 2100 at 60. Around town or off the line, there isn't much there. I do a combination of mostly street driving and some highway. I'm going to go with the 3.50's because 53 and Randy and I have quite a bit in common, except for my good looks LOL... I too have built my truck as a hot rod. I miss that quick off the line response. Thanks everyone. I'll let you guys know how the truck runs with the new gearing.
Posting Guru
Joined: Aug 2003
Posts: 1,243
Likes: 0
From: Michigan
Those calculators under Articles/Specs don't account for a O.D. Trans.
With combination that I have (Mild 351W/AOD,3.50 rear gear and 27.8 dia rear tires) I can brake the rear tires loose just by standing on the throttle (not like my mustang ( sure wish I didn't sell that car) did but it is fun))
Chuck.
With combination that I have (Mild 351W/AOD,3.50 rear gear and 27.8 dia rear tires) I can brake the rear tires loose just by standing on the throttle (not like my mustang ( sure wish I didn't sell that car) did but it is fun))
Chuck.
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Postmaster
Joined: Apr 2004
Posts: 3,005
Likes: 2
From: Santa Clarita
Minger, I bought my 3.50 gears from Summit racing. They also have bearing and seal kit for about $89 which is a good thing to get since your going through and changing things.
Junior User
Joined: Sep 2006
Posts: 92
Likes: 0
Thanks for the tip. I figure 36 yr old rear end, thelast 10 of it sitting in a scrapyard, something tells me thatthe bearings and seals are due. Thus truck stuff is enjoyable but man, there is always something else to add to the "to do"list.
Hotshot
Joined: Oct 2004
Posts: 15,882
Likes: 88
From: Durham NC
Originally Posted by merc546
Those calculators under Articles/Specs don't account for a O.D. Trans.
With combination that I have (Mild 351W/AOD,3.50 rear gear and 27.8 dia rear tires) I can brake the rear tires loose just by standing on the throttle (not like my mustang ( sure wish I didn't sell that car) did but it is fun))
Chuck.
With combination that I have (Mild 351W/AOD,3.50 rear gear and 27.8 dia rear tires) I can brake the rear tires loose just by standing on the throttle (not like my mustang ( sure wish I didn't sell that car) did but it is fun))
Chuck.