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Originally Posted by Not Anumber
I'm presuming you are asking this because you have a donor Capri on hand waiting to be reborn into a kit car ?
The Haynes came about amid concerns that rwd Escort and Cortina donors were no longer widely available. It is also has the benefit of being a stronger design than the original Ron Champion locost and was made wider at the rear to accommodate the wider Sierra IRS.
If you did want to build a Haynes Roadster but with a live (solid) rear axle you would need to integrate parts of the Ron Champion book (or McSorley etc) design when locating the axle and rear suspension. A mark 2/3Capri or mark 4/5 Cortina axle could be made to fit but a mark 1 or 2 Escort axle would just look too narrow for the standard Haynes bodywork.
As you will see when reading posts on the forum a version of the Haynes design has been developed using Mazda MX5 running gear throughout. Compared to that it should be relatively easy to modify the chassis design for a Ford live axle and there is always a chance one of the chassis builders may be able to make a suitable chassis for you. It's worth noting the development on the Mazda based variation was due to concerns about the future availability of Sierra parts- they can still be found now but likely to be a different tale in a few years. Everything moves forward as older parts become scarcer and newer parts become commonplace.
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Main problem would be axle width/rear track when using the live axle.
Sierra/mx5 have a much wider track and the haynes chassis is wider
You would need to find a suitably wide live axle which may not have suitable axle ratios available.