[Yukon Jack]

Boss, try a small block engine crossmember from a 73-up. Burt4x4 is using one on his and it gives good clearance. That or change to a different oil pan, assuming that is what is hitting the crossmember.

c-1072 - seems it varies on what kind of clearance problems you have. Some have to do nothing, some just have to dent in the firewall slightly. I'm still not sure why I had to make such radical modifications.