Sorry to butt in, but I thought the Ty crossmember was different from the 4X4 to provide clearance for the larger exhaust. I recommend double checking this before buying....
I dont have part numbers with me now, will check tonite
The ty one is square tube and actually sits lower than the 4x4 one. I have the 4x4 one in my ty (round tube). The crossmember sits higher in the truck with NO clearence issues at all. I have 3'' from the turbo back and there is plenty of room.
While you have your crossmember out check out the welds thoroughly.
Namely the trans mounting area.
Some of them didn't exactly get the best job closing up the welds.
It would be wise to finish weld it wherever they missed and POR15 it before putting it in.
Jas is right. I could see daylight through the welds on mine. Took it to orman's welding and for $20 they did double welds all around. Mine wasn't broken. There was no evidense of any welds where the daylight came through. Whoever QC'd out that contract for GM had their head up their ass.
George