Well I have posted here once about my car having transmission problems( meaning it wouldn't shift out of first gear) and the gentleman at the Cadillac dealership told me it was an input speed sensor problem. Now I recall someone saying that wasn't it if the speedometer was not working, well here is the weird part. I picked my baby up from the dealership and started driving it and it shifted perfectly, even the speedometer was working great. Then about 3 miles and a speed bump later the speedometer stopped working ( but the tach did ) and it went back into first gear and never shifted from there. What the heck could be wrong now??? Please help!!!