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In Reply to: Yanmar 1300D 4x4 Tire question posted by Dave Gallup on Friday, January 07, 2005:
In case you don't understand the situation, Dave, here's a primer.
Tire size must be at least similar on the two rears, or driving might strain the differential. However, the size of the fronts doesn't matter in 2WD. But if you can and do put the rig in 4WD, and then operate on a no-slip surface, unless the front tires have the proper rolling ratio with the rears (as determined by the factory), you'll strain and possibly break gears (because there's no differential between front and rear).
Here's a quick-and-dirty test. On a no-slip, flat road, engage 4WD. Drive forward 10-20' and stop. Then see if you can disengage the 4WD without having to reverse a bit. If you can, it suggests that the fronts and rears are in a properly matched ratio. If you can't, it suggests you have "lock-up" caused by the fronts and rears straining against each other.