SubTwin

The transmission mount and pitch rod suggestions are starting to make more sense to me as I think about it. Previously, when reversing slowly, while releasing the clutch pedal the car would make a fluttering or shaking sound. I thought it'd go away with a new clutch but it didn't. Maybe the mount is bad. If the engine has shifted pitch would that prevent me from shifting into reverse? Thanks all!

The replacement tranny has about 50,000 miles on it. Much newer than the original. Only reverse is affected. Are you saying that this a common problem? What causes it? If this has happened twice it makes me think that there is something else. The shifter linkage/bushings seems interesting. The release knob was not working allowing me to hit reverse when shifting to sixth. Would that suggest a linkage issue?

I have a 2010 Outback with 145,000 miles. In October the throw-out bearing failed requiring a clutch repair. a week following the repair the transmission would pop out of reverse. My mechanic determined that a replacement transmission was needed. Weighing the cost options (new, used, rebuild) I went with a used transmission (with a warrantee). The replacement transmission worked for a week then developed the same problem. I am on my 2nd replacement transmission and now after 2 months it pops out of reverse. What is causing this or is being overlooked here?