Ill check the spur gear to make sure its straight. Yes i did lock down second and it dont shift just stays in first it has alot of power it will flip on its roof if i deck it. I emailed Cen to see if anything can be done there gotta be something wrong with it i have check everything and even did the 3rd gear mod and it just dont engage. To make certain of this i tightend the ball set screws to lock 3rd gear in so its always in 3rd gear and there is a huge difference in the top speed when i did it. it even still shifted from first to second. I hope they can do something for me if not ill just buy a tranny off ebay. I think doing the 3rd gear mod may have voided any warrentee i had on it even though the mod is on thier site lol. For now ill just lock 3rd out and run it with 1st and second. Thanks for all the help and ideas.