Doublers are complicated. Several options. T-case gears can be a substitute.
Recipe: 5.29 gears, 35" tires, H-55 trans swap, 4-1 t-case gears, body lift, shackle reversal up front(gives you about an inch more lift), 80 series rear axle, IFS hub swap front axle, RCV alloy shafts with 300m inners, chromo hub gears, ARP knuckle and hub studs with a 5th stud conversion on an 80 series based crossover steering, hydro-assist box and ram, selectable lockers, sliders, belly pan, rear quarter guards, bumpers, winch, dual battery setup, header, cam, head work, good exhaust, good carb or efi, more fuel capacity, better seats.
That ought to get you started.
Recipe: 5.29 gears, 35" tires, H-55 trans swap, 4-1 t-case gears, body lift, shackle reversal up front(gives you about an inch more lift), 80 series rear axle, IFS hub swap front axle, RCV alloy shafts with 300m inners, chromo hub gears, ARP knuckle and hub studs with a 5th stud conversion on an 80 series based crossover steering, hydro-assist box and ram, selectable lockers, sliders, belly pan, rear quarter guards, bumpers, winch, dual battery setup, header, cam, head work, good exhaust, good carb or efi, more fuel capacity, better seats.
That ought to get you started.