NP203 Rear Output
I have a NP203 on a 75 F-250. While back while driving with the t-case in neutral the rear output began slipping. I had to put the truck in 4 hi to get off the road. After a number of other issues, the truck was lifted from the ground and with no weight the t-case would turn all four tires. Put it back down and the rear out put occasionally slips. The case was removed from the truck. If you turn the input shaft by hand it turns both outputs but you can stop the rear shaft with your hand. I know 205's in and out but know nothing about 203's. I'm about to crack it open and was wondering if anyone has any insight.