I recently installed Rok Lok 4.0's on my Summit and I really like the tires but now the balance seems off. It seems to want to roll forward if I jump anything, I am thinking I need to change the shock springs or something. Any suggestions from someone who has installed these tires. Also I got some shock springs that were listed as Summit/Revo but they are shorter then the Summit springs. Will these still work? I just got a second Summit via Ebay and that has brought up a few more questions. The body has been lowered, is there any advantage to doing this? I have the stock gears for it, but the prior owner regeared it to 58/20. I haven't ran it with that yet because it seemed rather extreme. Has any one tried this?