[SN65]

Yes I have seen that kit.

While the Mustang's plus kit does address some major issues, we are hoping to take things a bit further.

The inner convertible rocker assemblies add a huge amount of stability to the rockers (in two directions). The Mustang plus kit gets most of its strength from the short channel they weld to the bottom of the rocker.

They are adding a torque box, which is a major structural item. And, adding it in two pieces makes for an easy installation, but I wonder what gage material they are using and if there box is actually as strong as the factory design. The torque boxes we added are very heavy items with a number of contours that help in the overall strength. Also, the factory inner rocker reinforcements pass through the factory torque boxes and are tied together well making for a very strong assembly.

Also, the shape of the steel contributes greatly to the overall strength. And the way it is attached makes a difference in the strength. I prefer spot welds to stitch welds for almost all connections. Even though we will weld an edge to seal the seam and clean things up a bit, we always spot weld the material together before we seam weld it.

That is basically it for the Mustang’s Plus kit. They do box the end of the frame rail to the rocker, but that connection adds little to the overall strength of the chassis.

In our plan, the convertible seat pan assemblies are a major item. They tie the frame rails to the rockers and the rockers to each other, adding a tremendous amount of strength not only to the floor, but to the overall chassis assembly.

When done, we will have added about 180 to 200 lbs of steel to a 2,500 lb car. I am predicting a 90% reduction in chassis twist/flex on our test platform. At that point, we will have a chassis that can handle the high performance drivetrain and suspension modifications we intend for the car.

Sound like a plan???