Menu

Shop

Garage

Cart

Account

Products to Compare (max of 3)
X
Compare These Parts

How to Measure and Cut 9 Inch Ford Axles

10/6/2022
Add Article To List

There’s no denying the popularity of the Ford 9” housing. Over the last half century, they’ve proven themselves to be strong and easy to work on and they’ve ended up under countless hot rods, muscle cars, and even drag and circle track race cars. This popularity has led speed shops like Speedway Motors to offer housings to fit just about any application you can dream up. This means that there are almost infinite different widths out there. How do you get axles that will fit? Here’s where the popular cut to fit axles come in. In this video, we’re showing our preferred method for measuring and cutting 9” axles.

How to Measure

The important takeaway here is to note that there is not a standard formula that says what axle length is appropriate for what housing width. There are obvious variables with housing/bearing type, but also variables in the differential. Different types will require slight differences in axle length. So, our method involves assembling the third member to the housing, then measuring to the bearing surface. This method will account for these slight differences. Another important note is to pay attention to which axle goes in which side. In most cases, the short axle goes in the driver’s/left side.

In the above video, you’ll see us installing the axle, then measuring out to the end of the bearing. You can also stick a tape measure into the axle tube and measure to the stop in the differential. As we measured, we did not account for the thickness of the backing plate. This was intentional. You want to leave a little room between the end of the axle and the stop in the center section. Believe it or not, these axles actually twist under power, growing and shrinking slightly as they do. You want to leave a little room to do so, and that 1/16” of an inch or so seems to work well.

How to cut

We used a horizontal bandsaw. If you don’t have one in your shop, any means of cutting will do. Just be sure to keep your cut square. You’ll also want to use a file and/or a grinder to put a little lead-in on the end of the splines and dress up any burrs that remain.

Be sure to test fit before installing the backing plate or retainer. You should feel the axle slide into the splines well before the bearing seats. You should not feel the axle bottoming out against the pin in the differential before the bearing seats. You may also choose to double check your measurement with a tape measure.

This is not a difficult process. Just remember that every application is going to be slightly different. Speedway Motors offers axle assembly kits with all the hard work done for you, but if you’re building up your 9” piece by piece, be sure to measure carefully with the third member installed before ordering your axles.

Products Featured in this Article

Related Articles

Ford 9-Inch Housing Identification and Axle Measurement
by Speedway Tech Team - Posted in Tech
12/23/2021
Need help with rear end identification for your muscle car or hot rod? Learn how to identify 9-inch Ford housings and how to measure your axles with our diagrams.
How to Assemble Our Ford 9 inch/8 inch Disc Brake Conversion Kits-Tech Talk
4/27/2020
Learn how to assemble one of our bolt on nine-inch Ford disc brake kits in this step-by-step guide.
LS Engine Flexplate Fitment Guide
by Mark Houlahan - Posted in Videos
1/11/2023
The LS swap is no doubt still going strong, but if you’re planning to run an automatic behind your 4.8, 5.3, or 6.0L LS-powered ride, you’ll need to pay attention to a few items we discuss in this buyer’s guide.
How to Adapt LS Engine to 700R4 or Turbo 350 Transmissions
by Joe McCollough - Posted in Tech
1/6/2023
We show you how to keep that old GM transmission when swapping in an LS engine. Our LS swap adapter kits make it easy!
Chevy C10 Driveshaft Length Measuring Guide
by Joe McCollough - Posted in Tech
1/6/2023
Looking for a driveshaft for your 67-72 C10? Our custom-length driveshaft kits make it a breeze to get the perfect 67-72 C10 driveshaft length. Follow along as we show how to measure and install a C10 one piece driveshaft.
Why Convert to A One Wire Alternator
by Mark Houlahan - Posted in Tech
12/29/2022
Learn how to hook up a 1-wire alternator on your vehicle. 1-wire alternators are perfect for engine swaps or just keeping things simple for your project.
Install Guide: Upgrading a 5.3 LS With a Cam Swap
by Joe McCollough - Posted in Tech
10/31/2022
An LS cam swap can yield big power gains. And, you can do it at home. Here's how...
Modern Steering Wheels With Classic Styling
by Joe McCollough - Posted in Videos
10/24/2022
Looking to change that old steering wheel out for something that's a better fit in your hot rod or classic? Speedway Motors offers a wide variety of steering wheel styles that look right at home in your vintage interior.
C10 LS Swaps Made Easy with Motor Mount and Transmission Crossmember Kits
by Joe McCollough - Posted in Videos
10/21/2022
Looking to update that '67-'72 C10 truck with an LS swap? These motors mounts and transmission crossmember kit will make that modern powerplant and transmission fit like they came that way from the factory!
How To Replicate LS Engine Dimensions with a Steel LS Mock Up Block
by Joe McCollough - Posted in Videos
10/21/2022
The new Steel LS Mock Up Block from Speedway Motors makes it easy to fab mounts and check clearances while LS swapping your car.
Error
X
Note
X
Ok