Your problem is your gear mesh isnt correct. Gear mesh is how close/far apart your teeth are together. Im guessing your not using the stock engine in you rs4 cuz it should mesh properly. Reason is, on the stock engine, the engine has mounts built into it. So it sets mesh for you when you install it. I've heard numerous times on ways to set your mesh right and they always say the same thing. They say to put a peice of paper b/w the clutchbell and spur gears and press together. I found this way is descent if your sh*t up a creeck without a paddle. On my nrs4 2, i set my mesh by sight. I do that because the paper method is to far off and it messes up my teeth on my clutchbell. Besides, it never turns out he same. Since you dont know anything about how your mesh is suppose to look, use the paper method. When you get the hang of it, ditch the paper and set it by site so you can have better performance. BTW make sure you installed you 2-speed in correct
. I hope you got the heavy duty 2-speed, cuz the other one isnt worth the $$$.