I have the vortec max with 2300 magna charger.8 psi shiting at 6300 with ls9 cam.rite now i have my torque converter locking up in 4th gear at 45mph,i did some reading would i benefit from it locking up in 3rd gear?if so what rpm?my truck goes real good looking for any improvements.am i shifting my truck tp early?i have ls9 cam ls7 lifters changed springs but not to the doubles>>