I am building a new S&S 96" engine for my old sled. As I am also swapping out my rear swingarm, I will have the tranny out and sitting on my workdesk. The tranny is the only untouched part of my bike in 12 years of ownership, as its been behaving nicely, except a false neutral between 4th & 5th. This makes the tranny unknown territory to me - question: Do you recommend to overhaul it? - any tips as to what to look for/what to replace would be highly appreciated.