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Just did the rear wheel bearings on my '82 245 last night. As far as the axle shaft wheel bearings go, I believe your 240 rear end would be the same as mine. (But, yours would have a speedometer sensor at the rear of the differential, where mine does not.) While I could hear mine, they had not actually failed before I got a chance to replace them.
I used an earlier suggestion from the Brickboard and cut mine off with a Dremel tool and cut-off wheels. Worked fine. I cut most--but not all--the way through the lock ring and the inner bearing race, after removing the bearing cage, then split both with a few sharp hammer blows on a sharp chisel right at the opening I'd made with the cut-off wheels. Split right off with no damage to the axle shaft. Then I cleaned up and deburred the inside of the two items I'd split and used them to help align and drive the new bearings and lock rings into place. I deburred them to minimize the chance of damage to the axle shaft while pressing on the new pieces. The lock rings is important for two reasons: 1) It holds the bearing in place--thereby keeping the axle attached to the car, and 2) The sealing face of the inner seal, which separates the bearing and its grease from the gear lubricant of the differential, rides on the surface of the lock ring. You want to avoid any damage to the face of the lock ring so that that seal can do what needs to be done.
Pressed the new ones on--unheated--using a pretty large shop press in two passes, first the bearing then the lock ring. Don't forget to make sure the retaining plate is in place before you start to install the new parts.
Best of luck.
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