[Farmall450]

Originally Posted by sawdustdad

Yes, the tires spin freely in opposite directions with little to no resistance. If you roll them both in the same direction, there is some resistance, same as the front axle, indicating that they are coupled to the hydro--which has auto release valves, new a year ago.

When I had the hydro apart, I did not remove the cylinder blocks from the shafts, but they both turned with the shafts as you'd expect. I suppose the spline(s) could be stripped and my spinning the shafts by hand did not reveal that situation. There was no debris or evidence of metal pieces anywhere inside the unit. The pinion out the back of the motor block looks good and is coupled to the motor block shaft.

Yes, removing the rear cover is next.

The rear axle has been working up to this point fine, and was working just a couple weeks ago when I had both axles off the floor to sync them better. Engine running, both axles worked as expected.

It's got to be something simple. Hope it's the filter. Will replace that tomorrow. Also need to check the suction tube to make sure it's not plugged somehow. Should have checked that when I had it apart...

Let us know. That is puzzling.