Wishbone nuts under center of carWhere is the castle nut? I would suggest a breaker bar in 1/2 drive if you have it. Some times you need to use an impact wrench to get them loose, if all else fails a gas wrench.
I have drilled them in the low spots opposite each other, from the top of nut with a small 1/8", bit, then tap with a chisel and they will come apart.
Did this to some perch pin castle nuts, worked good.
Where is the castle nut? I would suggest a breaker bar in 1/2 drive if you have it. Some times you need to use an impact wrench to get them loose, if all else fails a gas wrench.