www.offroaddesign.com makes a 4 inch shackle flip kit, it is $189.99. you can buy a 2 inch longer shackle for a two wheel drive (lowering kit) when used with the flip kit it raises it two extra inches. Thus having six inches. But that is hardly home made. On top of that a shackle flip kit only lowers one end of the spring. That changes the wheel base length. Example: rear of spring is pushed down six inches axle moves forward. tire is no longer in the center of wheel well.
something to think about$189.99 flip kit, $60.00 two inch longer shackles = $249.99 or two superlift 8 inch rear springs $125.00 each x2 = $250.00 = axle in center of wheel well and two more inches.
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but you can lower all of your spring hangers as low as you want in your yard with a grinder, welder, torch and about $100.00 worth of steel.