there is no transfer case on this car so the report most be incorrect
but the car may have had the trans repair or replaced as this year Altima car has known trans problem
the vibration may be from a misfire cause by something with the engine
this car also have a 120,000 miles 10 warranty from the factory on the trans so it may still be covered if you have lest than 120,000 miles on the car
let me know if you have more questions
I also saw vehicle same year, make, and model that has only had a cooler replaced and and oil gasket replaced
is that as major?