Rear Sway Bars

Lots of good advice being given. Agree strongly that for top notch handling you should approach it as a system. The valiant patrol car in my avatar came with a factory rear sway bar and it oversteers (rear end loses grip and swings out trying to pass the front end, ala drifter style) nicely. I recently upgraded a '62 valiant driver with 6 leaf rear springs (4 leaf was standard) and it made such a significant difference that I'm not sure I'll add the rear bar anytime soon. Point is, as others suggested, more than one way to reduce body roll. You'll feel the difference with new rear springs or a sway bar regardless, and at lower speeds it really won't matter usually. As others have suggested it's near the adhesion limits that good or bad suspension balance becomes apparent.