My brother has got a sj410 flat deck that my dad and I have built up for. Its 4age powered with 32x11.5x15 wrangerls. beadlocks and jus recently, 2" OME lift springs. If you are going to lift it, avoid longer shackles and bodylifts and go for the OME lift springs. They are incredibly good. Awesome ride and wicked flex. My bros one was too budget for the shocks aswell so it runs commy wagon rear shocks in the front, and some other random shocks I had lying around in the back. With the motor and the suspension and tyres, it is truely amazing where this thing goes. It kicks the ASS out of 90% of trucks Ive been wheeling with, which mostly consist of heavily modifed non road legal wagons. Im not a massive fan of the 4age and would go swift gti next time but the things that make it good are
Suspension (it just ran out of flex before and it cross axle situations it plain sucked, and the ride was crap)
Decent tyres (make a huge difference to teh wheelability)
Motor (cause you gotta be able to spin them tahs)
Seat time (mods dont make a truck great, drivers do)
Leave it without lockers for now, with the right driving these things go anywhere!