I recently purchased a fully rebuilt H55F gearbox and transfer case (by a Toyota 4x4 gearbox specialist) which has now been fitted into my FJ55 with a 2F engine. First impression was the whine under load in 4th and 5th gear was excessive. To the point where it's almost as loud as the engine. I flagged this with the guy who rebuilt it and he told me that there are new parts meshing with old parts and that it will need a 10k break in period. Sort of understandable but even if it was half as loud after a year of driving then it would still be a noticeable whine. The gearbox has also completely jammed up when parked on 2 different occasions over the last month. After rocking the car back and forth, side stepping the clutch, jacking up the rear of the car and generally wrestling with it for 30 mins to an hour it finally un-jams. Again, I've gone back to the guy and he's now shrugging his shoulders as to why it's getting jammed. Has anyone had similar issues to this with a rebuilt H55F gearbox?