i just got my new driveshaft put in the car. I have a powerglide and yesterday was the first time the car had ever moved. I went through all the gears checked the fluid levels. Everything was great, sat the car down and went to push it out. nothing. After checking rear brakes then rear pinion and ring i realized the driveshaft was siezed in the tailshaft. Has anyone ever had this happen, what should i do?