Well, I did change the fluid about three weeks ago and cleaned the screen and the filters. No leaks or anything. Sealed up cleanly. Thought maybe I didn't fill it up far enough, so this weekend I jacked the beast up on the port side so that it was listing dramatically on its starboard and filled the tranny until there was fluid running out the fill hole and capped it. No change. Also cleaned the contacts on the solenoid and everything electrical underneath.

Basically, it will not shift into 5th unless you are travelling at about 65+ mph. Warm or cold, apparently no difference. Sometimes it will shift at 55 or so, but often it will immediately shift out, sometimes it will wag back and forth. Or there's a concussive sub-sonic vibration to it while it tries to decide what it wants to do. When coasting to a stop, if left in OD, it begins to lurch forward and backward between 55 and 45 -- almost like the clutch is slipping dramatically.

The relay, the switch, the button, the wiring (and -- my memory is hazy -- I think something else -- solenoid?), were replaced on it about 60k miles ago after another long-running nasty bit with it not engaging. Quite sure that was all electrical. It was performing flawlessly up until this sudden shifting problem. I actually trusted it for a little while.

Am wondering if there is something clogging a relief valve inside the OD or maybe the filter and screens need to be cleaned again. Or maybe I got the wrong/bad fluid? Manual specs Type FA. Ideas? I DO NOT want to have to tear this thing out and rebuild it. Too many sad things in 700/900 FAQ sound vaguely like what's going on. Thx.