I have a 4l65e in a 4x4 Nissan with LS6 running 36' tires and 4.33 ratios and am busy tuning the motor (SD) My problem is that when it changes from 1st to 2nd with my foot down hard the box changes but I get a burnt clutch smell for a second or two. I have reduced shift time and upped the pressure but it still slips when changing gear. Under normal driving conditions it changes with no problem. Is this a tuning problem or can the 4l65e just not handle the torque with the large tires?