I have a recently bought Volvo 240 '86 with automatic transmission. When taking off there is a slight bump just as the transmission shifts gears. It seems to be coming from middle/rear of the car.
Driving at speeds slow enough not to warrant a shift produces no bump. Shifts between subsequent gears also do not produce any thump.
Should I suspect driveline or transmission, why is it only happening on the shift between first and second gear?
/Kris