Hissing noise in reverse
Is it possible that when the engine torques toward the driver's side in reverse when the clutch is released, that it somehow pulls on a vacuum hose, to open a leak that you can hear.
ie connection at power booster, or vac fitting on manifold.
"hissing" is deceptive, would it be more of a scrape? as in the tin shield at the bellhousing ?
can you post a vid?