This is not a bad idea . . . . Land Cruiser 80 Series are old now (1991-98) and are getting more common in wrecking yards. These axles are coil-sprung both front and rear.
Go with a 1993-98 model. These have four wheel disc brakes, a high-pinion 8 inch front diff, and a 8.75 inch rear diff in a full-floating housing. If your lucky you might find a set fitted with factory electric locking diffs.