Ran new parts yesterday for testing purposes. Started with the losi springs. The traxxas #3768 shock collars were a good fit (they're for the 4x4 slash). Started with red front and yellow rear. Coming from the stock springs and that being the only change I noticed the rear rotated a little better without stepping out, but the big difference was how well it jumped and it didn't get crossed up near as much. At the track I run at ( west coast rc) there's a couple of jumps right before turns and the car landed and turned much more consistent without spinning out. Ran the yellow rears all night but tried Orange fronts. Lost a little exit steering but the car felt more reactive and turn in was more responsive.

Tried the shorthand lipo too. With it spaced 1.5 spacers from full rear, felt much like a normal battery, but car seemed a little lighter and more reactive. Moved it all around the battery slot and the really cool thing is moving the battery has a greater effect than moving the longer battery. Ended up 1.5 spacers from full front ( I like a lot of steering). Never an issue with punch or runtime compared to reedy lipos.

Lastly I tried the online axles. I didn't get much time with them cause I was trying too much stuff already. Didn't noticed as big a difference as the past, might be the longer chassis. I did notice the car changed direction better in the low speed turns, but wasn't as twitchy at high speeds as it was in the past. I'm going to try my things next week, one day of practice isn't nearly enough. Hope that helps a little.