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Tom,
Which wheels set up do you have? 15 or 17". Backdrafts are pretty sensitive to proper wheel balance and in some cases alignment (what little you can do!) But I have found on the 15" set up, the cheap BFG or Goodyear tires are usually to blame. Neither brand is very round! Get them balanced and on some tires even "truing" will help. Or replace any tire that is just too out of round. I hear this is not too unusual. On the 17" set up, the tires are so big, that the balance and alignment are critical. Once that is accomplished, it should be much better or OK. Make sure the rest of the front end/suspension is secure as well.
Early cars like mine (#90) had some sagging spring issues. I am not sure at what chassis number the new better springs were factory installed. All I know is Backdraft sent me new springs and things are much better now. Unless your car had the old springs, 1400 miles is certainly not enough to wear anything out!
Try the above fixes first before you spend a bunch of money on frame stiffening. I know John and he loves what it did to his car. But, without good balance and alignment, it would be a waste of money.
In any case I originally had balance issues (15") wheels. I had them rebalanced, added hub-centric rings to the wheels (aids in centering the wheels on the hubs), and had it aligned, and corner weighted. Problem solved.
SkipB
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