My ML350's 7G gearbox worked perfectly. So I thought.
But with cold start it was sometimes a little rough from 1 to 2. I thought that was just normal 'cold' behavior and all shifting became very smooth after 2 minutes of driving.
Still I decided to change the transmission oil and filter and it was a pleasant surprise that my 7G box became even more smooth than I thought possible and the rough 1 to 2 when cold completely disappeared.

/happy

 

Did you use a different trans fluid or filter? I changed mine and the cold wierd shift is still there. Only happens when overnight temps get below 35F. Mechanic checked the trans and all checked good.