I've isolated the problem in my transmission to a dirty governor valve in the transmission. The governor valve is located at the rear of the transmission in the tailshaft assembly. Has anyone ever replaced or cleaned their governor valve? If so, does it require complete removal of the transmission, or can you take the tail shaft assembly apart without dropping the tranny all the way out? I know I would have to at least drop the exhaust and drive shaft. What about fluid? I'm assuming the whole tailshaft assembly is full of fluid. Any advice?