question about cooling your engine oil

Are the tranny coolers rated for 80+psi? I know the cooler lines are under minimal pressure from the trans as they are just drain back lines. Also even the VW coolers use 1/2 inch tubing, let alone the 5/16 connectors used. I think the trans lines in the rad are alot smaller than that for volume to a V8. You could wrap the header pipe with Header wrap, that stuff works great. Some say it will weaken the header under its extreme heat retention but I wouldnt worry about it.