A couple of things you should do when shopping for one of these Simplicity/Allis tractors other than inspect the bevel gear box are;
1. Put the machine in gear and roll it back and forth. This will tell you how much slack is in the drivetrain. I've seen some with quite a bit of play and you will really notice it on uneven ground.
2.Jack up the rear end at the center and check for up and down movement between the axle and bushings.Replacing the outer axle tube bushings requires complete Disassembly of the transaxle. If these bushings are badly worn, the shim washers that control axle side to side motion are probably worn also.
Take your time when finally making a purchase. I've found that some of the ugliest ones had tighter drivetrains than some of the clean ones. These are great little tractors and many parts are still available for them.
Edited by classic, November 21, 2014 - 08:35 PM.