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Old 01-29-2011, 06:31 PM
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Steering question: NHRA

I'm in the process of building a 1937 Chevy drag truck. The truck will most likely be running in the 10's but want to build it to Super Pro (7.50-9.99) specs..just in case I ever want to go that route. The truck will be running a very healthy SBC and a powerglide w/brake hooked to a Ford 9" rear.

The truck is slowwwwly get put together. I have partly installed the cage (1.75" x .134 wall..I know I only needed to use 1 5/8" tubing but had a bunch of the 1 3/4" sticks laying around.)...Still need to install the door bars and rear cross bar..but still deciding on a seat and can't put those in until the seat is in place then I'll know the proper bar heights with me sitting in the truck.

So Steering is my question..I plan on running a tube front axle. Would a traditional "side steering" setup be legal or should I plan on a conventional "cross steering" design??

Thanks-Tom
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Old 01-30-2011, 12:16 AM
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NHRA regulations 3:3 doesn't specify any specific steering systems, other than OEM may not be modified, and there are bracing, butt weld and other general requirements for frontal impact protection, etc.

There's no way you can build a safe, legal class car without the regs and rules. Join the club, NHRA, IHRA, whatever.
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Old 01-30-2011, 10:39 AM
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Do as 68... says get the SFI spec for your build and save a lot of hassel when it comes time for inspection. We just had the NHRA inspector in yesterday to inspect both funny cars and they passed with no changes. We had the SFI sheets for the new car and every check point was gone over and every tube was checked for thickness as well as weld quality.

As for your question; The FC still use a drag link jointed in the middle. They don't use any suspension at all so there is no bump steer or geometry change.

In your case if you want a hairpin style and drag link at least use a jointed draglink with a bellcrank at the rear pivot of the hairpin to reduce the bump steer. You can also use a bellcrank and use a cross steering. Additionally I would purchase everything I could for the front end rather than make it. It simply is more cost effective. There any number of places to get this stuff. Join NHRA and get the Nat Dragster. The back of it has about 1000 mfg of every race part made.

There isn't anyway I'd use a junkyard steering on a 7.50 car.
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