This past weekend my friends and I tore out from Houston to lay it down on the three sisters in the hill country. I'm riding a 2003 HD lowrider anniversary edition with 42k+ mi. On the way back I experienced slippage from the tranny riding 80 down I10 back home and completely lost 5th gear. I shut her down and found either 2nd-3rd gear or 3rd-4th gear. 1st neutral and 5th can't be found. Shifter resets as it should. Any ideas please help. Suzy is my only mode of transpo.