Clearance for 1 piece driveshaft on LWB

[Tiger Joe]

Just did a tremec trans swap in my 67 long bed. I have to get a new driveshaft and was hoping maybe to go to a one piece. I searched and people have done it, but I don't see anyone saying how much clearance you need between the carrier bearing crossmember and the driveshaft. Or at least how much people have and if the shaft ever hit.

The local driveshaft shop recommended a 3.5" aluminum shaft for my truck. It's lowered and I just installed the CPP crossmember. My measurements say with a 3.5" shaft I would have right about 1/2" clearance. Doesn't seem like enough to me. Really don't want to back up my brand new crossmember.

Shop was worried about the length but did caution me I would need to make sure the driveshaft didn't hit the crossmember as one snack would likely ruin the $500 shaft