The frame was fully re-engineered to accept the Corvette rear suspension and to survive the torque and power of the engine. I fabricated all of the frame parts and had Donsco, Belmont, Ca, TIG weld the assembly. Donsco was in the business of manufacturing off-road vehicles.
The rear 1/4th of the original frame was cut off and replaced by modifications to which the Vette rear suspension would connect. The original frame ran under the Spitfire stock half-shafts. The Vette rear suspension required an overhead frame member for mounting. The modified frame components were constructed out of 2" x 3" x 1/8th" cold rolled rectangular steel tubing. I ran 2" x 2" x 1/8th" square steel tubing from the new rear frame members up to the front of the stock frame. They were attached to the stock frame at several places to enhance full strength. This approach modified the stock "hourglass" frame to an "H" frame with cross-member. The frame is very rigid and has worked flawlessly since 1970.
This is the only picture that was taken of the original construction - my dog Kodiak was relieved that I didn't use him to power the car.
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