Originally Posted by DSGoose
Maybe I have my terminology wrong. I'm talking about the plate that's fixed to the transmission input shaft. If you're going down a hill, in gear but with clutch depressed, the rear wheels will be driving the transmission gears and input shaft. So, wheels and driveshaft will always have the same rpm at 65mph, but wouldn't a different transmission gear selection affect the input shaft's rpm (and anything that may be attached to that input shaft)?