What is the average cost to replace the rear section of the driveshaft

I thank you for you quick response. I will purchase thewhole shaft. What degree of difficulty is the install?

The degree depends more on one's tools and experience. It won't be impossible, but it will be more difficult without a lift to put the truck on. I would say it's the same degree of difficulty as doing a brake job on one axle. It looks like your drive-shaft may have a center support bearing, which requires preloading to avoid vibration and quicker wear. Be sure to search/read up on the proper install procedure if you're doing this at home!