Some people on here are sold on Fabtech. For me, the jury is still out. I do not like the fact that the front wheels are 2" wider than the rear with the Fabtech--due to their spindles. I also have fixed some because the panhard bar bracketry is sub par.
At higher speeds, the kit just does not perform in my opinion for a number of reasons. In your post, it does sound like a driveshaft balance issue but there are many other things that could cause it. To save yourself some bucks, just remove the front driveshaft and take it out for a spin.
If you are close to NJ, I will fix the kit's weaknesses for you!
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