My buddy with the 05 WK 3.7 running the 4 inch BDS and 3.73 gears had the AEV Module for about two years with no problems. When we did the gear swap he had to get the Hypertech Speedometer Calibrator. We tried keeping the AEV module installed and the tune with the Hypertech but his Jeep wouldn't allow both to be programmed at the same time. We ended up taking out the AEV module and he's now just running the Hypertech Speedo calibrator upgraded to the Maxx energy programmer or whatever it's called. He has had no ESP issues with the AEV module.