While I think any forward progress is good, I agree with most of the posters about it helping but only at the level you're at now. Something else too... How sure are you that the springs are good? That might explain the "wandering" you feel in your seat. Not traction, just not good suspension control at higher speeds. That is a sing of bad springs too. The deal with the lack of traction bars on mopars comes from having a snubber that's properly set up and traction bars, which can interfere with each other. I also agree that a Glide with 4.10s will hit much softer than a 727 with the deeper first. I think you would go faster with 3 gears providing you can actually hook it with the extra torque that gives.