C- NOTCH INSTALL ?

On my 83 pup, the rear frame is boxed in, do I install my notch to the side of the frame rails or on top of the frame rails..

Sides

'93 Isuzu, but gives you the basic idea..

Thanks for the info it helps me out alot...

so just weld it to the sides than box it in,than cut out the frame part?

That's the basic idea Let me know if you need the pics, I guess the host crapped out w/ the ones above