DC, like Tim said, lots of good stuff in Tech Tips, including that gearbox adjustment, and like the other guys said, could be a combination of things. I went thru a spell of twitchy steering at hwy speeds as soon as I got mine roadworthy last year, and I checked all the things the guys mentioned. Everything I did made an improvement, but my experience found that the biggest improvement can from getting the toe dialed in. Spec is 1/16" to 3/16". And checking toe is something you could do/adjust yourself. Do a little research and there are all kinds of info out there on alignment, or just take it in to a shop ultimately, as it's nice to see what the actual figures are. But you want to check out and rule out whatever you can before you go out and pay for that alignment. Flakey steering at hwy spds ruins the whole driving experience otherwise. You'll figure it out. Good luck. Dave