Stock ford 9 inch gear ratios

The Jalopy Journal. Terms of Service. Privacy Policy. Log in or Sign up. Atomic Industries www. Register now to get rid of these ads! The H. Highest stock gear ratio in 9inch rears? What's the highest numerically lowest ratio put in 31 spline truck 9inches. I've got a 3. I've got what I believe to be a 2. Something similar to stab in my 9inch housing would definitely be sweet. Oh, and if anyone has anything close to what I'm looking for, I'll probably be interested in buying I'll check my books.

It was a pretty wierd deal and part of an econo package I think. It was a dog Economy went down the shitter though lol. CJ SteakOct 22, I run 2. Common 70s big car smog gears. RichFoxOct 22, Well, sweet. Thanks for all of your input so far. I guess now what should be said is that I'm looking for a third member with 2.

stock ford 9 inch gear ratios

I don't think there is any such thing stock, you'll have to combine a 31 spline carrier with the awful gears. You can find the 2. TomP64Oct 22, Im not trying to be an ass.

I am really wondering why you would want anything more than a 3. I had 3. JimSibleyOct 22, I have a set of 2.The Jalopy Journal. Terms of Service. Privacy Policy. Log in or Sign up. Atomic Industries www.

Register now to get rid of these ads! The H. Hey guys, After some number crunching I decided that I'd be happy with a 2.

How to Tell What Gear Ratio Is In An Axle

TimOct 26, You have to find them used. They're not as easy to find as they used to be. They were installed in lots of big ford cars in the 70s. I've put a lot of miles on the set I have in my blown big block 55 chevy.

I just purchased a for 9 inch. RAY WithOct 26, There used to be a lot of 2. Last edited: Oct 26, I have 3 sets of gears. I am using one set in a 28 chevy and the other is being used in a 27 chevy and the other is undecided at this time. The other came out of a mercury monarch also non posi 28 spline. There still out there. Ghost28Oct 26, That should be close enough.

If you don't find used, Randys Ring and Pinion can get any ratio you want and fast. If you do not need high priced gears get World Brand. I am running them in my T Bucket and they are fine. If you want better gears try Yukon. Randy can guide you on this stuff. I don't think anyone makes a new 2. There is almost always a couple of 2.Available in open, Trac-Loc, Powertrax, Truetrac, and full light weight spool.

We do not ship to PO Boxes. Choice of Gear Ratios: 2. A made John's billet aluminum pinion support A new forged pinion yoke of your choice. Available in 28 or 31 spline, and 33 spline spools with your choice of carrier. Available in ratio of your choice. Features a super strong through-bolt design to give the case increased strength and decreased ring gear deflection common in most aluminum case designs. Our aluminum cases are also designed to be used with either a standard pilot bearing with snap ring retention, or a heavy duty, wider pinion bearing utilizing button head bolts for retention is available.

Bolt- through aluminum performance cases weigh only 16lbs, 15lbs lighter than our Nodular Iron Cases. All cases are CMM checked for machining accuracy, and are supplied with all Grade 8 hardware. Bolt-through aluminum performance cases weigh only 16lbs, 15lbs lighter than our Nodular Iron Cases.

Available in open, Trac- Loc, Powertrax, Truetrac, and full light weight spool.Ford began production in and stopped production in though many after market companies still produce this rear end. This makes the rearend easier to service because of its removable centersection that houses the gearset.

This removable gear case houses a differential unit that the ring gear bolts onto. This is even more important if for dual purpose vehicles. This strengthens the rear end assembly but results in a minor loss of power to drive the gears. At some point no matter what axle you buy, that axle will break if you are doing something rough.

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Many vehicles have been produced. Besides producing car, Ford also creates its own gear. If you have ford car, Ford 9 inch gear ratios chart is useful to inspect what gear your car uses. The chart consists of several columns that represents ratio, ring teeth, common factor, and pinion teeth. The next section will explore several aspects related to this topic.

As you know, this ratio is useful to accommodate repairing and maintenance. First thing to understand in Ford 9 inch gear ratios chart is related to gear ratio. This gear is commonly called as axle used solid configuration that changes from pinion teeth into center. This is revolutionary technology because the car can accelerate faster. This gear was introduced in early s.

After this technology was released, almost many Ford models rely on this gear.

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The ratio consists of several numbers between 2. When ration is 3. The biggest ration is 6. As you can see, those numbers use certain configuration. Big ration reduces pinion teeth, but the ring seems vary. Check the chart for more comprehensive list. Next section will explore why you need Ford 9 inch gear ratios chart. In general, the chart help to measure ratio that your car uses.

More about application is explained at below list. Early model of Bronco and Mustang had this gear. You can tell the differences between this axle and other cars without Ford gear. Mustang produced smooth gear transition and fast acceleration. The old car with this gear needs specific repairing and maintenance approach.

Some mechanics might not know what gear on the car. Therefore, using chart helps to determine the gear ration.

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After that, the maintenance can be done properly. Even though new gear is updated and released with different tech, everything that you know today is from the past generation.

Mechanic training must know how to handle the car with Ford gear. Engineering students learn about this gear and do research for better application. As it mentioned above, this chart provides clear instruction and calculation. Good thing about modern era is calculator for Ford gear.Before you embark on the rebuild and start scouring local scrap yards and online websites, it will be helpful to understand what to look for and what to avoid in these axles.

First, you need to understand some fundamentals of the Ford axles to help guide your quest.

stock ford 9 inch gear ratios

I have spent countless hours over the years collecting, reading, and studying old shop manuals, supplier reference documents, SAE papers, and even vehicle manufacturer reports and notes.

Some of this information is very important as it is becoming more and more difficult to find documentation on axles and differentials that were built more than 40 years ago. I have also spent many hours in scrap yards and visiting and interviewing the experts in this field along with years of building numerous axles myself. In this chapter I share a summary of decades of work on these axles.

As part of my research, I went to renowned Currie Enterprises and gathered one of just about every different 9-inch axle variant.

I put together a whole collection of housings and third members.

stock ford 9 inch gear ratios

This is a sampling of some of them. Here is a quick visual summary: The housings do not have dimples on them and have an oil drain plug.

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The s and s have two dimples on either side of the housing and some have drain plugs. The s to s still retain the dimples but also have an oil level plug in the back cover. The Ford 8. There is typically a stamped steel cover that must be removed to gain access to the internals.

This chart serves as a general guideline for axle fl ange-to-fl ange width based on different models and production years. I have included the narrow 8-inch axles for reference. The narrowest production 9-inch axle is If measuring the drum-to-drum distance, add. An assortment of Ford 9-inch axle stampings is welded together to create the housing.

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The cast-iron third member is installed from the front of the housing. The third member supports all of the gears and bearings, which allows for easier gear ratio swaps if you have multiple third members.

I reference these axles based on the ring gear nominal outside diameter in inches. The fundamental difference between these axles is how the gears are supported and which end of the axle housing front or back that they are assembled from. It may seem strange to begin by comparing the 8-inch to the 9-inch axle, but there is an important distinction to make since the 8-inch axle is weaker than the 9-inch. Many people are not aware that Ford made a smaller banjo axle and confuse the 8-inch for a 9-inch.

The 8-inch was introduced in and is found in many lower performance Fairlanes, Mustangs, Falcons, Comets, Cougars, and Pintos, just to name a few of the applications. All of the 8-inch case nuts can be accessed with a socket. Both axles share a common design and are often referred to as banjo style or third-member style. The smaller 8-inch just cannot handle the abuse as its bigger brother can. The 8-inch also was only available with tooth axle shafts.

Unless you are building a Pinto or straight six-cylinder vehicle, you want to avoid it. The smaller 8-inch third member is on the right. The 9-inch third-member bottom fasteners, on the left, can only be accessed with a wrench.

Both 8- and 9-inch axle housings are made from a series of stampings that are fixtured and welded together. This complex fixturing and welding process, coupled with fuel economy concerns, is what eventually led to their production demise.

These axles had a stout 2. The larger offset is better for strength and noise but worse for sliding and efficiency.Terms Of Service.

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3.55 Ratio Differential Ring and Pinion for 9 (Inch) (Dropout)

Thinking about putting a 9" rear end in my F1. I found a nice 9" rear end out of a Ford pass. Does anyone know what the rear end ratio options were in this car? I have a 3.

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I am in the process of changing from a 4 speed to a rebuilt 3 speed top loader also. Re: Ford 9" rear end. Most likely it would be 3.

3.25 Ratio Differential Ring and Pinion for 9 (Inch) (Dropout)

Depends on what engine the car had. I had a 6 with a straight stick that had 3. Lock up one axle, turn the free axle, count the pinion revolutions and figure the ratio. If you use a housing from a pickup with a 9 inch before it should be the same width and bolt in. I think from 73 to 86 will bolt in but be wider. I have used quite of few of the '57 rear-end's in various projects. Almost all had the 's as previously posted by Craig. They work good with a T The Custom I parted rusted in half had a 3.

My Ranchero has a 3.

stock ford 9 inch gear ratios

It all depends on the transmission gear ratios, as to what rear ratio will work best, this applies to automatics as well as manual transmissions. If you have to go out and spend money for a three speed, think about spending a bit more and look in to a five speed.

They are Soooo, nice. Jim, auto trans have a lot of different gear ratio's in the lower gears, but they all have 1 to 1 final drive, except the over drive trans. I'd hold out for one of those. They're still plentiful and offer a wide range of ratios and have the same wheel bolt pattern.

Ford Axle History and Identification: Ford Differentials

I've seen a bunch of powered F's with 3. You're right though, you could probably run through a field of 3. Here is a link with some info that might help you identify the ratio if that rear end was the original in the ' The truck rearend would be better 57 to 72 the car length is about 4" short ,not wide enough. Thread Tools. All times are GMT The time now is AM.

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