lol lmao at least it's not a difficult box to take out, and all of the bolts will be free. (We have it basically ready for out, and it took less than 45 minutes from propshaft to bellhousing bolts, ready for the morning)
Sssssso, it wasn't selecting gears, and everything inside the bellhousing is a clump of rust. Had to undo the clutch pressure-plate bolts to pull the gearbox out with the clutch still attached because it was seized onto the input shaft.
Anywaf, cleaned everything up, polished the rust off the input shaft snout so the release bearing slides nice, put the clutch back in because it has plenty of life on the friction material, build it all back up...
...still won't select gears. clutch servo is pulling on the clutch like it should, but it's throwing a learn error. Work called in a specialist who does some diagnostic reading with the proper tool (and the proper knowledge), and says the pressure plate must be seized internally because the servo's moving the release bearing like it should but the clutch is still not releasing, based on there being no change in input shaft rpm.
So here we go again with a new clutch!