64-66 Shelby Drop Template  (Arning Drop)

Made in uk From Stainless Steel 2mm

Officially called the "Arning Drop" — named after Ford's suspension engineer Klaus Arning — but everyone knows it as the Shelby Drop, because Shelby American used it on the original GT350s.

It's a simple metal drilling template that bolts over your existing upper control arm mounting holes on the shock tower, guiding you to drill two new holes:

• 1 inch LOWER than the original position

• ⅛ inch FURTHER BACK toward the rear of the car
🔧 What It Actually Does

• ✅ Not just lowering the car — it changes the suspension geometry. The car only sits about ⅝" lower overall

• ✅ Raises the roll center — dramatically reduces body roll in corners

• ✅ Improves the camber curve — keeps the tyre flatter on the road when cornering

• ✅ Adds positive caster — better steering feel and straight-line stability

• ✅ Reduces understeer — the stock car pushes wide in corners; this fixes that
🛠️ How You Use It

1. Remove the coil spring and upper control arm (support everything safely!)

2. Bolt the template over the existing holes — arrow points FORWARD

3. Use the guide holes to mark your new centres — centre punch them

4. Drill pilot holes first, then open them up to 17/32" diameter

5. Reinstall the upper control arm in the new holes

6. Remove ⅛" of shim/spacers from the control arm shaft to compensate for the new angle

7. Get a wheel alignment — essential after doing this!
⚠️ Important Notes

• This ⅛" rearward offset only applies to 64–66 Mustangs — don't use it on 67–70 models, theirs is different

• It works with stock upper control arms — if you've bought aftermarket adjustable arms, check if they already have this mod built in

• Do NOT cut your coil springs AND do this together — it will be far too low

• It's one of the best-value handling upgrades you can do to an early Mustang — cheap, effective, and proven since 1965 🏆