[SPF1061]

I would say that the people who have stock TKO 600s that shift good are the exception to the rule. They lucked out and I am happy for them. Most TKO600s are very glitchy and shifting can become difficult and unpredictable at high rpm. I've logged 65k miles on three different stock TKO600s and that has been my personal experience. About 5K miles ago I had a complete engine rebuild done and I replaced my stock TKO with a Liberty modified TKO 600. I have not missed a gear since. I would recommend this upgrade without reservation.