My manual shifter will lock into 6th gear whenever it feels like it. I only shift up to 5th gear now and that tachs out @ 2500 rpm going 80-85 mph but it does use a little more gas without 6th. I did some research and it listed (2) possible causes. A leaking input shaft or worn synchronizer plate, both require trans rebuild or replacement. I've had my Crossfire for 16 years and maintained it in almost pristine condition with just now reaching 80K miles. I'm afraid to have my Euro shop take the trans apart and find out I can't get the parts any longer or purchase a remanufactured one. Anyone else had this issue with their manual shifter?