Bob: 
	Quote:
	
	
		| "I acquired a 1937 Chev one ton pickup frame a while back ....some interesting comparison can be made....." 
 | 
	
 The 37 frame is too early, you need to look at a 39/40 frame , Mike
Maybe  other C8 owners are not aware of this .
The C8 rear axle assembly , including the springs , was already in production with the civilian 1939/40 rear axle as fitted to the 1 Ton chassis . I know this because I have a 39 1 Ton Chev here .  I measured the springs - same size. 
The torque tube is longer of course . The brake drums are larger too. 
I cross referenced the parts books . The axle half shafts, same part number.