I just did a team conversion on my secondary and will now begin testing different springs. Anyone out there using this conversion; please let me know what you think about it. The only thing I haven't figured out yet is which way to go with weights; will probably start with the stock 75's and go from there. Looking forward to some testing. It doesn't get any better than this, riding the best crossover sled on the market and having fun! Damn, I love this sled.