I had a weird thing happen one time with a 27 roadster running a Vega box with an aftermarket Pitman arm. The car steered okay around town, but at 50 MPH I would get this strange 'zero backfeed" sense from the steering wheel, as if the entire steering had "come undone"---NOT A NICE FEELING AT 50 MPH!!! As soon as I slowed down, it would feel okay again. This really freaked me out, so I started checking from front wheel bearings inward. What I found was that the taper on the aftermarket Pitman arm was a tiny bit oversized, and even though the castellated nut was run right down to the shoulder at the end of the threads, and the big lockwasher was in place, the Pitman arm would still "flop" up and down about 3/8" at the tip. I fixed it by taking the nut off and adding a spacer washer and then reassembling it. It was one of the strangest steering sensations I have ever felt, and anytime I hear of someone experirncing "loose" steering with a Vega box, I tell them this story.---Brian