picures needed
 

does any body have pictures of a bare c40 c50 frame? and a bare c30 frame?

Re: picures needed
 

Might have something that can help, but what are you wanting to know? The C/40 up trucks have straight rails up to about the front axle centerline. C/30 down frames go up down in and out depending on model and wheelbase.

Re: picures needed
 

How large of channel are the c30 vs the c40. are the c40 straight all the way to the front bumper or are the bent over the front axle?

Re: picures needed
 

Need to dig out a truck spec. book for all the section heights. Maybe this help some. The C/40 frame rails are flat on top from just forward of the front axle centerline to the rear. Forward of the front axle centerline they drop down and in a little. Note in the the picture that the springs go from outside to under the frame rails. Also the frame section aft of the rear axle forward spring hanger tapers up from the constant section of ~9.12" to ~6.50" all the way to the end.