During the course of helping install a rebuilt engine and tranny into an 85 GMC High Sierra, my given instruction of putting some tranny fluid into the torque converter was not followed. Truck starts, and (surprise) when they try to move it, I get a "hey, the truck starts and goes into gear, but it doesn't move" phone call. Turns out the torque converter is totally dry. Now, I know the transmission pumps fluid into the torque converter, but obviously this is a problem if the engine can't transmit any power to the transmission. So, I'm wondering if we can turn the transmission driveshaft doing something like putting it into gear and pushing it around (a lot) or if we're screwed and have to drop the tranny and have to put some fluid in the converter.