If the castle nut is threaded the full depth of the uncut threads plus enough for the cotter pin, there is plenty of thread engagement.
What tire height do you want? I can help you find a size that will fit those rims.
Are you looking for a highway tire? A knobby truck tire? Something inexpensive?
Do you need high speed of high weight rating tires?
Edit: to clarify, the castle nut has enough thread engagement assuming it is properly torqued. Given what else you have found, I would be real tempted to pull the cotter pins and retorque everything.
I would also recommend inspecting the welding job on the crossmember/sping hats real close to make sure that wasn't phoned in. A bad job on that is the kind of failure that kills people.
Last edited by Fibonachu; 10/19/2023 10:25 PM.
