The rear CV joint anatomy
What is a CV joint? (drive axle, universal joint, velocity joint or whatever you want to call those)
They are drive shaft with 2 flexibles universal joints at each end that goes from the transmission to the wheel. They transmit engine power to the wheel. They are found on any independent suspension car / van. If a 4 x 4, you will have at least 4 of them + 2 more similar one between the front and the rear (those one donít need as much attention and servicing)
Why doing a job like that?
The down side: most drive axle that you will find at any auto parts are rebuilt one, sometime cheap or even partially rebuilt joint will be put on the so call new drive axle, so know your part dealer and ask for a good rebuild company. (Even VW use a rebuilt company) The VW drive axle, good news and bad news: The bad new is that they are quite expensive. (About 180CAD + core for 1 complete axle / $100USD + core) EX: I pay $60 ($45USD) for a Honda Civic axle.
The good new is that they are serviceable and you can buy each velocity joint / universal joint (or complete kit with boot) (2 per axle) separately. About $100 CAD ($50USD) each. You can also buy single boot or single boot kit (include grease, 6 Allen bolt, c-clip retainer)
Unless you have a perceptible drive axle noise, there is no way of knowing the condition of each joint before you carefully cleaned them.
The Vanagon axle is well design and of very good metal quality. If properly maintain it should outlast the vanís life.
I would recommend a 50k km (30k miles) servicing, new grease & boots