I order some items from Geno's for the first time and a black shift knob was one of the things. This is not a plug for Geno's! The main reason for the purchase was for a unique knob, but to my liking the transmission shifts alot smoother. My guess- the weight made the difference. I have the nv5600, which has been tight from day one. So my point is anyone that has a notchy manual - try a good heavy weight knob. Just passing my findings.