Reply to Leon R:
Thank you Steve, I will give that a try. Leon
I'd try diesel for sure, you have nothing to lose if those steering clutches are frozen because you don't have much horsepower on your side to help free them.😆
Get as much diesel in both sides as you can and if possible drive the tractor too, but just remember once you have them working you will need to drain the oil from the transmission and final drives as it will most likely be contaminated with the diesel weeping past the seals.
I'd also be tempted to flush those steering clutches with kerosene once I got the clutch packs slipping again, just to help clean the clutch plates and brake bands.
Good luck
Mike