I have been slowly overhauling a 1987 190e 2.3 Litre with 58,500 original miles. When I bought the car last summer I was told the automatic transmission was just rebuild and the car shifted fine in both forward and reverse gears. Now that it is getting cold in New York, 12 degrees on Monday, when I put the car in to reverse the car jerks for a moment as reverse engages. I don't use the car very often. Maybe once every week or two. Does anyone know of the transmission would jerk because of the cold weather affecting the transmission or fluid. The car appears to shift fine when I'm the road and the transmission fluid looks clean and does not smell burnt. Any suggestions?