What is the tread wear? What are the sizes? In addition, what layout is the track were you will be doing driving? It does not sound like you have driven the track before... A few members have switched back to the stock gears because the 4.10 was limiting their tap speed on the 1/4 mile. But very few people have that problem. I would say get stickier tires and keep the leader gears. Learn to moderate your throttle on the track and you will benefit from having the increased response out of the turns from the leader gears. Just my 2 cents. PS: you have a great setup! you purchased it used will all of that work done?! What ever you paid for it, I bet you saved a small fortune compared to doing the work your self. Enjoy the car :-)