Back in 2011 I installed a Tom Woods greaseable front prop shaft and since then. I've done about 80,000 miles. Shaft has been greased every 5000 miles and there is no noise or any play in the shaft. My question is due to the mileage should I consider replacing it soon, or just keep servicing it as needed? How long do you think a properly maintained prop shaft should last?

 

I think properly serviced bearings of any type last almost forever.

 

If you're concerned about it you can drop it out and make sure all the joints still move freely. No slop, no tight spots, just good smooth motion. If you detect an issue I would not replace the whole shaft, I would just find a local driveshaft shop and have the 3 universal joints and the centering ball/boot replaced. Much cheaper than a new shaft, and less wasteful.

 

This!