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Power Strokes
6.4 Aftermarket
4 link set up decisions?
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[QUOTE="footlong70, post: 1335124, member: 8456"] No sir, "bump steer" is specifically the axle shifting side to side in a different arch/rate than the drag link throughout travel. Therefore the axle is moving side to side following the track bar arch, and the draglink (on a slightly different arch swing) is ever so slightly pushing the knuckles in and out (based on the degree of difference) as you hit bumps. It literally making you steer left and right just by hitting bumps when the steering wheel is held perfectly still. A parallel track bar and drag link is the only way to fix it in our situation. Bad caster angle is just bad caster angle. Positive caster is good because its the self centering force that keeps you feeling stable and straight. Bumps or not, it lets you drive more passively. Extra positive caster beyond spec usually doesn't hurt anything either as far as handling, in fact it helps handling within reason. It just further reduces the steering wheel input required to keep the tires centered. Negative caster is the issue we have with stock radius arms and lift kits though. Negative caster is bad for any modern vehicle. It removes the caster effect and forces the person holding the steering wheel to keep the tires straight at all times. It's effects are further exaggerated when hitting bumps which is what your getting at. These are the vehicles that are scary to drive and make the vehicle wonder/ steer where they shouldn't. Either way, a four link or three link can fix the caster issue that stock radius arms can't. A four link though is the only way to keep the caster virtually the same throughout travel (unless the 4link geometry is way out) in comparison to a three link that varies significantly. To the average person, most wouldn't know the difference if they are set up correctly. [/QUOTE]
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