How did your Borgenson steering setup workout? B4 doing the drive-train, have u considered a possible wheel tire balance issue? Not saying, the problem not in the train area - just inquiring about balance issue. I had a vibration issues, driveshaft was bent and out of balance, another issue -- exhaust system contacting chassis somewhere. When I changed long tube headers for shorties -- high frequency vibes disappeared. Exhaust sys. issue was resolved simply by chance - had no idea it was the issue.