Here is a pictorial of what Jerry is describing.
Boxing plate template with steel pipe contour and TAPERED transition end to prevent cracks:
[img]https://i.postimg.cc/yDTZ7rcZ/c-notch-frame-007.jpg[/img]

Template used to mark cut line on outside of frame:
[img]https://i.postimg.cc/7J75dBqb/c-notch-frame-006.jpg[/img]

Filler cut from HEAVY (1/4") wall pipe
[img]https://i.postimg.cc/vctBnxTR/c-notch-frame-004.jpg[/img]

Filler/brace welded in place (much grinding required here due to welder ineptitude)
[img]https://i.postimg.cc/XpjZQkTN/c-notch-frame-005.jpg[/img]

This C-notch is for rear axle clearance on a lowered truck but exact procedure is used on front.


Evan