Measuring driveline offset at transmission

How do you determine what your offset is from center at the transmission? Someone mentioned "measure using the pinch welds" in a b-body forum. How do you all measure it? I believe on an A-body it should be like 1 1/4 - 1 1/2" or thereabouts toward the passenger side. I just want to know what points of reference people use to measure it.
Author: admin