Early Mustang 1" Upper A-Arm drop

[V M Kauffman]

When Joe Spinelli was restoring the Super Stock Maverick I had a chance to see the body. It had that mod done to it. This mod is to drop it 1 inch and move it back 5/8". There is a diagram in the old Ford Boss 302 chassis book. Another Ford trick is to heat the steering arm on the spindle bend the arm down right at spindle about a inch the heat the portion that tie rod attaches to and bend that mounting hole back up about a inch the helps bump steer. It's a lot of work but it's worth it.

Originally Posted by Joe Grippo

Has anyone done the 1" Upper A-Arm drop modification (Shelby Drop) on their 64-70 Mustangs? While primarily a road racing thing, there are supposed to be some benefits in lessening the positive camber gain on the launch and wheelstand. I have spoken to a few guys and they seem to be split on whether there is a benefit to doing it.. I am trying to keep the wheels straighter on launch, as now the tops of the tires lean in. How did this modification effect your alignment?
Any thoughts?

[Mark Markow]

I would think drilling holes and changing mounting points may be a no-no. I know tall ball joints and off set shafts are used. but I would check with your div. tech director about changing the mount location?

[Joe Grippo]

Thanks for the replies.

Ryan, I will definitely call your Dad about this...Probably early next week.
Mark, I should have mentioned this is a bracket car.

Joe

[Bill Diehl]

If you have no travel limiters moving the upper down one inch will do wonders but the real trick as mentioned above, is to move the upper control arm back. Doing so will add more positive caster and allow the car to "track" better going down the track. when you get it right you can put it on the bumper, land and continue on without ever "fighting" the steering wheel

see my build below in the build section...wait I don't have those pics up yet was supposed to be top secret..lol