Ok, so I got a 1994 vulcan with 163k miles on it, runs pretty good or it did until the abnormaly cold winter NY is having started. When the extreme cold started the car started to act like crap, mainly the tranny not the car. First it wont shift out of first for a couple blocks, after limping for a couple of blocks going about 20-25 in first gear it starts to shift thourgh the gears but not smooth shifts, not to bad for up shifts the 2nd to 1st shift is bad makes me slide forwards in the seat sometimes and on top of the crappy shifting my speedo dont work. AFter the car gets hot and stays hot for a while I duno like 40 minutes or so it starts to act ok and speedometer starts to work. So the tranny has been doing really well up until this started i did have the needle bouncing a bit on the speedo for a while though it started to bounce a lot more when the cold started. I have flushed the tranny every year or so with quaker state 4x4 syntheic tranny fluid (meets mercon specs) and it was just done last about a month ago. I checked teh specs for teh tranny fluid and its not cold enough for it to be a problem according to datasheet it should be good til -40F almost got to 0F at some points but never did the level of fluid is fine also. So my thinking is the the VSS (Vehicle Speed Sensor ?) went bad since the speedo is controlled by the cable going to the trany and that dont work and i guess the shifts could be bad because the computer has no clue how fast the car is going so its defaulting to some limits that are crappy. I dont know, probably get a new vss soon and try to change the old one hopefully it will fix the problem. Looking for comments or other suggestions, thanks.