Rayt

My 2008 SEL is doing the exact same thing as described. Today is day 3 in the shop for servicing this problem. I determined in that speed range, when the vehicle needs to downshift, it cannot properly engage the lower gear, it "fumbles" around and then finally downshifts. The "fumbling" is a hard low frequency vibration until it kicks in. I hope they can find the cause. The two chips (engine and transmission)have already been reprogrammed with no success to report.