Starting in 2012, non-Rubicon autos come stock with 3.21. The front and rear are the same. It's the axle that's different front to rear, not the gears.
4" of lift is too much for 35s.
Cancel your order and place a new one if you want 3.73s, or just regear aftermarket to 4.10s for your 35s (about $1200 to $2000). 4.10 would be better for 35s anyway.