I have a C-4 in my 55 sunliner and the trans is making some noises that sound to me like some bushings are going bad,the shifting of the trans has not changed but the noise is getting louder. Other then the output shaft and possibly a bushing in the pump for the convertor are there any other bushings between those two that I need to specify to be changed by whoever rebuilds the trans if those parts are not normally changed during a rebuild.