R6cowboy

iTrader: (3)

5th and reverse problem in '00 C5 with T56.
Recently noticed 5th gear grinds on the 4-5 shift only when shifting very quickly at high rpm / topping out 4th. But it shifts perfectly smooth under normal driving conditions. Was told that the reverse lights also are turning on when this 5th gear grinding issue occurs. What could be possible issues?
Also, as soon as this 5th gear issue started, the trans started grinding sometimes while shifting into reverse at a complete stop. Sometimes it will shift into reverse just fine, but most of the times grinds. If parked on a slight incline and I shift into reverse during an ever slight roll, it will shift into reverse just fine. It will also pop out of reverse as soon as the car starts moving when backing up.

Are these two problems likely related? Or is it more likely that there could be a couple different problems occurring as once? I did some researching and it seems the 4-5 shift grinding is likely a faulty reverse lockout solenoid..?? But could that also cause the reverse grinding issue?

Thanks for any help!

Forcepower

iTrader: (23)

sounds like you could possibly have worn fork pads or bad syncros

moge11

pads and broken keys.. had the same problems... apparently you like slamming 5th gear like i do..

R6cowboy

iTrader: (3)

Just now getting back to this. After taking the trans out, seen the reverse problem was worn out reverse fork pads and a very worn reverse blocker ring, of course that caused the teeth on the reverse synchro and reverse gear to get chewed up. The 5th gear problem was a faulty reverse lockout solenoid.