Just received pictures of a 990 Detroit on steel ! A friend of mine located the tractor and took the pictures. It is a rice tractor that has rear factory steel! The front end is on rubber. But, is a Case axle? Claimed the Case axle was a lot stronger, so the oliver axle was changed out? Tractor is in good condition for the age! Will go look at it in a few weeks. Engine is free! Who has seen a 990 on steel?