Guess it would depend on how much shock travel you want and how crappy of a ride you're willing to deal with. But I would guess not more than a couple of inches before it rode like total shiat. I put 3" coils on stock length shocks for a couple of days and that rode like crap, the front end bounced all over the road until I swapped everything out.
Running without shocks will destroy the suspension components you just bought. I would not do that. Shocks are friggin cheap, you can get some Doetschtech ones in nearly any size you'd need for $25 a shock, or save for ranchos when they have their buy 3 get 1 free deal. You can check exactly how big you can go before changing your shock by taking 1 from the front and 1 from the rear off. Then measure it's collapsed length and extended length. Put the shock back on and see how much extension you have left.
A forum community dedicated to custom off-road vehicle owners and enthusiasts. Come join the discussion about trail reports, builds, performance, modifications, classifieds, troubleshooting, fabrication, drivetrain, and more!