Hot Rods 1940 Ford rear Axle and Frame Centerline

Installing a 9” in a 40’ Ford
How/ what should I do to measure and find rear axle centerline on the frame?
I am installing the Pete and Jakes kit. I see how far apart the brackets should be but not the starting center line on the frame.


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Axle centerline is straight below the center of the bumpstop. There is a 3/8" hole at the top of the kickup that is for the bumpstop. You will need to trim the front of the crossmember for clearance with a 9" as the back of the housing will hit the front of the crossmember.

 

^^^^^^

 

and move the axle back one inch so it looks right in the fender opening. The way Henry did it looks awful