Undo the front and reap propshafts and let them hang on a piece of good rope, remove the gearstick, undo or disconnect the breather pipes, remove the top bolts from the bellhousing and check the thread size, screw in a couple of straight rods with the same threads tapped on the end.

Undo the bottom and starter bolts and remove the starter, fit another couple of rods into these holes, undo the crossmember and take the weight on a jack, slide the whole gearbox/transfer case rearwards until the mainshaft is clear of the clutch, then a few inches more. Remove the rubber gaitor from around the clutch actuation rod and fire a light in, slide the thrust bearing forwards and it will drop in the bellhousing, slide the new one on and rebuild.