Drop hangers

[dabels23]

The thread on homemade lifts got me to thinking (yeah dangerous) I want to lift my 82 K2500 about 4" I've been looking for lift spring for the front, and was thinking about a shackle flip in the back but that moves the tires fo. I don't like blocks and rear lift spring would lower the towing capacity (right?). So I wondering if making all new hangers that are 4" longer than stock. Keeping same wheelbase and using stock springs. I work for a mechanical contractor and I could lay it out in CAD and get our metal shop to fab them up. Any suggestions and advice would help.