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Shelby Arning Drop with Stock Parts?

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Hello everyone. I am replacing the front suspension on my 1969 Mustang Mach 1 using all stock replacement style parts. I would like to do the Shelby drop and lower the upper control arms by 1 inch. My question is - can this be done using all stock style parts? Or will any of the other components need to be modified or changed? Also, will this cause any clearance issues with the tires? I am using 14x7 Magnum rims with 225x70x14 Cooper Cobra radial tires. One last question: how dangerous is it to remove and reinstall the coil springs? I have heard stories but it seems like it shouldn’t be too difficult if you are careful. Thanks for your help!

CB012B49-8C06-411F-A4EE-6617852D47B1.jpeg

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Make yourself a template from something like 1/8" or thicker steel.

- Drill two of the bolt holes in the template the correct size to bolt to the existing control arm bolt holes.

- Then drill the two new 1" lower holes in the template only 1/8" diameter for a pilot drill.

- Bolt the template in place, drill two new 1/8" diameter holes in the shock tower using the new 1/8" template holes as guides

- Remove the template and finish drilling the new holes to the final size in a couple of more steps.

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something I wish I was told before I did this, but I can also blame myself for not thinking about it, is not only lower control arm holes but relocating them slightly rearward to increase caster without the wheel being pulled too far forward in the wheel well.

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1 hour ago, lanky said:

something I wish I was told before I did this, but I can also blame myself for not thinking about it, is not only lower control arm holes but relocating them slightly rearward to increase caster without the wheel being pulled too far forward in the wheel well.

exactly what i was going to suggest Lanky. I did this to mine and also set the shaft in control arm forward a thread or two. all this made the grease fitting to close the the shock tower so I plugged the original hole so I positioned everything the way would be torqued down and marked the nut hex flat facing out. took back apart and drilled and taped the hole. With this modification and lower control arm pulled forward as far as I could without tire rub on valance I got 5 degrees caster. I had CPP intergral steering box similar to Borgensen and the car drove awesome.

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One more question: I removed one of the coil springs and after decompressing it, I compared it to the replacement spring I bought from CJ Pony Parts. The new spring is about 3/4” longer (and almost one full coil longer) than the original. Note that the springs I bought are for a small block. The original engine was a BB 390 but it was removed by the previous owner. After I bought the car I installed a SB 351W. The old springs appear to be original since all of the other suspension parts also look untouched. The spring pitch is the same on both coils. Thoughts?

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Try the new springs as they are.  Lowering the upper control arms will lower the front of the car almost 1".  That 3/4" longer new spring might work out okay as it is.  If it's too low they make thicker coil spring upper insulators.  If it's too tall, you can trim the coil springs.

Did you compare the wire diameter of the new and old springs and also the number of coils?  Both of those items affect the spring rate.

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