Can you give us a little more info? Has somebody told you to use 6 degrees? Manual steering? Wide tires or not? Stock U bolts? Old springs or new? Modified springs or stock?
The reason I ask is with 6 degrees with good stock springs I believe you might be flirting with some jacking effect considerations.
Jon

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end