mf1250 rear end, 4X4 noise, PTO not working

[masseytrouble]

am new to this forum and still learning my way around. I sent this post to a coupole guys that gave me some good advice, I thought I should send it out to the tractor repair guys in general. Last year, my MF1250 started to make noise when in 4X4. THe noise came from under the center of the tractor. I quit using 4X4. This past weekend, I was realy stuck in some mud. I engaged the 4X4 and then the differential lock. When I applied the throttle, I heard a grinding or rumbling sound in the rear end. Two days later, when in 2 wheel drive, turning a circle to the right, I heard that noise in the rear end again. I tried to engage the PTO, the light on the dash illuminated but PTO did not work. The mechanical PTO engagement lever is actuating the lever into the rear end. I also checked the fuses and the fuse for the PTO is good. I removed the 4X4 drive shaft to examine the couplers, and they were fine. I am wondering if this worn front axle bearing or long shaft situation initiated all of this. Have you guys learned anything more about this situation? There are no massey dealers in my area and I will need to fix this on my own. The 4X4 selector slips out of position and makes noise when it does. Thanks