Not sure until I pull the th400/208 apart. My 4500 will be here Tuesday. I’ll be able to better wrap my head around it then. I’ll be diving in next week. Just some prep this weekend, might pull the 400/208... I’m going to weld up a crossmember to avoid the 4” block spacer. Seems like a better idea than plopping a chunk of 4” box tubing on top of the existing flat crossmember.