I replaced the rubber plugs on the upper shift rail of the transmission on my '93. I took out the shifter to retrieve a core plug i hammered in too far. Afterwards i got a very funny feeling 5th, it would go part way into gear, the you'd have to push harder and it would "snap" into gear, almost like a tractor pto lever. And there was no reverse, it wasn't that it would go in and have no gear, it was something like puting a 4 speed into 5th. It just hits a wall and stays in neutral. I had discovered a lever attached to a pin on the 5th/reverse side (driver's side) of the trans on the trans cover had become misaligned. I'm wanting to know what this lever is, is there a governor inside the trans that blocks off reverse when it's moving? I'll post a pic when I get one. Trans is a Mazda m5od-r1 F27A.