07-12 Cummins 6.7 Smarty J-67US Tuner Differential Comes with 6 springs

Comes with 6 springs

06-07 Dodge 5

Smarty does NOT set ANY codes once the ECM is set back to stock

you're not getting 100% of the power that those other modifications are capable of providing

the computer will see an open circuit and send a trouble code

07-12 Cummins 6.7 Smarty J-67US Tuner Differential Comes with 6 springs07. 5 12 Dodge Ram 2500 3500 Cummins 6. 7 All Smarty Jr.'s now ship the REVO software and PoD (Power on Demand) pre loaded. It has proven to offer the best combination of mileage and power available. This product is geared toward the customer who wants reliable and safe power for both the engine and the transmission combined with good fuel mileage. Key features: 40 70 100 hp power levels Ability to adjust timing and torque management to suit your