if you get under the vehicle and grab each proposhaft you can feel if there is any play at all in the joints at the end. If so they need changing.
I have seen up to 1/2" of play in neglected joints but they make vibration, not grinding.
To change you need the following tools:
- a vise
- a hammer
- a pair of pliers
- some odd nuts and bits and bobs of metal
Unbolt the driveshaft and remove, takes less than 5 minutes. If you jack the vehicle up put it on stands but most you can get under without jacking which is MUCH safer. Get it on the bench and you will see the joint is held into the yoke on the shaft with a circlip in each end. Prise out the clips. You now need to force it out and puting it in a vise with several nuts etc to exert force on it will get it to move, I just beat it with a hammer and punch on the ground though this takes longer on old joints.
When you have it apart the bearing cups will drop off and you may find a lot of black dust and metal filings. This was your bearing.
Getting it back together make sure you lube the joint well before you install. There are needle bearings inside most of them so make sure you do not let them drop out and load them up with good quality bearing grease and pressure grease them once on, lubing the sliding joint as well. Lack of grease is a cause of failure.
The only other thing to know is that the shafts are balanced and the two parts are on a sliding joint that will drop apart. Mark them first so you get them back on the same way round or it will vibrate.
With practice (yes, you will get practiced) you can get them apart and replaced in about 30 minutes with simple hand tools.
However the grinding noise may be something else.
BagusJeep lives in Bali.
1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
1995 Cherokee 4.0 - CHEROKEE