What do you mean, “modify the rails”?

We have had quite a few questions about installing our Mustang II kit in cars that don’t lend themselves well to a conversion. Sometimes “modifying the frame rails” is necessary. What exactly do we mean by that?

I thought I’d put together some pictures that show a few frames that have been modified to accept a Mustang II crossmember. If you have any questions about your frame or any of our parts, please email or call toll-free: 1-888-648-2150.

This Oldsmobile frame has been bottlenecked to accept our Mustang II crossmember.
This Oldsmobile frame has been bottlenecked to accept our Mustang II crossmember.
The '57 Oldsmobile has received a similar treatment, but the builder used larger diameter tubing straight forward from the firewall.
The '57 Oldsmobile has received a similar treatment, but the builder used larger diameter tubing straight forward from the firewall.
You can see the spring clearance notch in the frame rail in this picture of the finished '57 Olds.
You can see the spring clearance notch in the frame rail in this picture of the finished '57 Olds.
Here is a Welder Series Mustang II in a 1978 Volvo.  Extra material was 'wrapped' around the existing front rails of the unibody car.
Here is a Welder Series Mustang II in a 1978 Volvo. Extra material was 'wrapped' around the existing front rails of the unibody car.
A '57 Ford frame has the springs mounted inside the frame rails.
A '57 Ford frame has the springs mounted inside the frame rails.
The '57 has been cleaned up and 2x4 tubing was used to mount our MII.
The '57 has been cleaned up and 2x4 tubing was used to mount our MII.

If you’ve put our Mustang II kit in something “weird”, please send us some pictures!

4 comments

  1. Decky69 says:

    After you have spent a lot of time modifing the frame rails to accept the cross member, you might save a couple a hundred dollars, over buying a sub frame from Fat Man ready to weld in. Its not worth the trouble.

    • DW Horton says:

      Doesn’t each person have to decide this? We provide parts to help people save money (your figures… “couple a hundred dollars”), have fun (your words: “spent a lot of time” equals fun for lots of builders), and feel great (Lots of people: “Look at what I did, dear!”). For you this might not work in this case. I hope we can help with other areas of your project.

      Paul Horton

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