I had the update installed and thought it was better but after a day of driving it's the same. Some one else on here has posted they had to have their torque converter changed. I went back to the dealer yesterday morning and had the shop manager go for a ride. between 35 - 40 it is real bad and it did it the entire time he was with me. It is scheduled to go back in on Monday to do some more checking. He thinks it might be the converter or MDS. I was a certified ASE mechanic for a few years, I think it is the converter not wanting to release. We shall see. My Belltech kit is scheduled to be delivered around the 13th so I want to have something done by the middle of the month if possible. Pinion angle and driveline shutter are to close to mess with and try and argue what was first, the shutter or the drop.