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there is a thud sound and a slight jerk when the car goes from 1st to 2nd gear. on 1997 Volvo 850

when car accelerates from standing zero miles, there is a thud sound and a slight jerk as the automatic transmission goes from 1st to 2nd. But at higher speeds, the gear change is smooth.

Asked by for the 1997 Volvo 850
possibly due for tranny service. bring to a tranny shop for this and have them run diagnostic. tranny tech. will advise.