I am removing my 4.3 V6 to be replaced with a fresh engine and I have everything unhooked, but for some reason, the engine will not disconnect from the shaft. The shaft is stuck in the coupler, is there a snap ring or something up in there? I can wiggle and jiggle and lift and shake the motor but the shaft will not come out, I have EVERYTHING unbolted, the flywheel housing, motor mounts. I even took the outdrive off the gimbal. Are there any tricks I am forgetting or do I need to give up and cut the shaft with a torch, if so, how much do you think I am looking at for a new one. Any ideas would be great cause I am getting ready to fire up the torch or the saw.