:40: I just finished installing the three speed on my K 4.6 kit . I chose the kit version because I wanted to install the reverse module at the same time.Tht was a really fun job. If you have the ready to run, and arent putting in three speed you migt as well just spend the extra 25 bucks unless like Doesgo You want to familiarize yourself with youre tranny.The instuctions with the kit are great.As long as you foolow them you will have no problem.As for performance,I live in Oh. so it was only 38 degrees ,kinda hard to really heat it up ,so as far as top end .It seemed faster but the low end was awesome rigt from the start .Cold engine and all. I anticipated this so I installed the HPI wheelir bar while I was at it.Good thig to ,The stock tranny will lift the front pretty easily but with that lower gear,Holly @@@.Remember this is at 38 F. Just fired up. Anyhow I hopr this will help. If you decide to go kit ,and have any issues .Feel free to E mail or post.Good Luck. C~Ya