Sorry to keep dragging this thread along but.....I also have the same problem with my T4R's steering at highway speeds. I mentioned this same complaint on here back in 2004 when I first purchased my truck. The steering wheel needs
CONSTANT attention to keep the truck straight when at interstate speeds. This steering is TIGHT and gives the truck a "darting/ jerky/ bucking" feeling!
I believe, as one other poster mentioned, that the bucking feeling comes from the wind resistance/ air flow over the T4R. I noticed the bucky feeling picked up slightly after I added the rear spoiler.
At first.....I too, thought it was the DumbFlop tires and adjusted the air pressure as many of you have done. I found that running at 32-34 psi does help the problem a bit but it does NOT totally correct the drifty, darty feeling you get at interstate speeds.
In contrast, the tight steering feels
GREAT when traveling the city/country roads at speeds slower that 40 mph. I've also found the steering wheel will vibrate slightly when the tires are cold but diminishes after my tires get thoroughly warmed up. BTW, I have the 4X4 and whenever I drive in all wheel drive (4 Hi), the truck seems to have a more grounded/stable feeling when at Hwy speeds.
My assessment is: this is the way the truck was designed to drive. Why? I don't know........perhaps to cover the all terrain ability of the truck. You can't lay the seat back and steer with a couple of fingers when at Hwy speeds that's for sure.
