Project EmtyyNest runs the absolute minumum backspace at right arpund 5" on a 12" wheel which gives a full 6" lip to the wheel. To achieve this low backspace, you will need to use either our G bar / Air Bar rear, or buy our lower link brackets, or fab your own lower link brackets as the stock leaf pads and supplied brackets will limit how much you can narrow your rear.
As for maximum backspace, it is almost unlimited. As Jake mentioned, we are doing Vinnies wheels now at a 8" backspace for a stock rear and mini tub. You could actually probably go somewhere near 9" backspace if the rear is widen, which we will know soon as we have a project going this way. So your backspace can run anywhere in this range.
Whenever you get ready for your wheels, or G bar for that matter, let me know and we can dial you in from plenty of experiance.
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Frank Serafine
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