Thanks for the help. I just used a bigger screwdriver with a square shaft and pushed the screwdriver hard into the slot of the screw while turning the shaft with a crescent wrench. It came out easily. I have another question about the rear axle now that everything is apart and the axles, differential assembly and pinion and driveshaft are out. While taking apart, cleaning, then reinstalling the rear axles, is it a necessity to replace the rear wheel bearings? how about all the pinion bearings and the ring gear bearings? It seems to me that the pinion and ring gear bearings might be ok, but how do I know? How hard is it to replace all these bearings and what tools would I need? In the manual I see all these one time use special tools for every step of the process, but I don't have anything like that. If I have to replace them, would it be easier to send the assembly to a mechanic to replace the bearings for me?
