i have a sn 95 ho gt the other day i pulled out my speedometer gear from my trans it had 19L i bought the same my speed is still of by at lease 3-7 and gets greater as i go faster i pulled the new gear back out and it is already getten chewed up. I my self never changed the gears so as far as i know it was stock.does anyone thank i should try the 20-21 gear its a manual please help