I'm not sure about the use of the Char-Lynn unit on the sprint cars, but we installed one on a late model back in the early '80s. Worked very well, but all feel disappeared. We had to put a piece of tape on the steering wheel to remind the driver where to hold the steering wheel so the front wheels were pointed straight. Ran it a half dozen or so times and scrapped it in favor of a power rack and pinion. Our Char-Lynn unit came off of an old Farmall M.
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