..Bruce is right. There is a sill on each side of the frame where it kicks up. I'll bet if you slide the sill along the chassis with the block underneath it you'll get to a point where you may find the hole in the chassis.
Curious if you find the holes.

Maybe this will help. This is my 37 and the one just before the rear. No guarantee that this is 100% correct due to condition of my truck when I started on it but I "believe" it is correct.
http://i140.photobucket.com/albums/r19/LutherParris/Nexttorear.jpg

Last edited by Achipmunk; 10/30/2012 10:37 PM. Reason: clarification

1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile