I took my center line from the straight axle,I used a small torpedo level and placed the edge of it center of the axle with the top of the level touching the frame above, when the bubble is center make a mark on the top of the frame, this is your center line, if you then use a square with the edge of the square on the frame you can draw your line accros the top of the frame from your mark you made with the level. I did it this way to install my Fatman mustang 2 crossmenber and it came out dead nuts.........looks great......


1972 Chevy Cheyyenne, 1959 Chevy Apache