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The trophy light that I was doing suspension tuning on this weekend had steering issues. It was all over the place. The rear end was also VERY loose. It swung the rear around more than a 800HP TT. Took some bar out and the rear got happy but it was almost un-drivable in the rough. Finally started looking at the steering column. None of the U-joints were clocked right. The servo was out of phase from the rack and the wheel. Amazing what a few simple changes can do. Truck is better but I still don't like having a U-joint at a 40* anglebetween the servo and the rack. They never feel right.
Most folks complain that Charlyn units are twitchy on asphalt. Unisteer is charlyn type so I always wondered how the street rodders could use it with out issue. Makes sense that a front engine with a longer snout would reduce angle. Based on your findings, must be the angle of the dangle? Mine is squirly on the road. I may have to see if the Charlyn can be salvaged as I assumed I would just have to upgrade to rack at some point. That is a project for another day though.
Right there is the reason.