I'd say do the replacement, using the newer materials whenever available.
You may be surprised at the way your ride works when everything is changed
out....even though you think it's fine now.
   it's not too difficult, though you do need to get the alignment right,
or find a good Vanagon guy for that.

On Tue, Mar 12, 2019, 4:07 PM Richard Koerner <rjkinpb@sbcglobal.net> wrote:

> I have owned my 1985 Vanagon GL for 30 years.  It is a 4 speed manual,
> tintop, with GoWesty 16" wheels, and has power steering.  I now have
> 273,000 miles.  I am planning on keeping if "forever".  I'm wondering...is
> there a rule of thumb regarding suspension components and when it might be
> wise to consider replacement of bushings, ball joints, and such?
> I have only replaced the front and rear shocks; no other work has been
> done to the suspension.  I currently have no issues with vibrations or
> unusual tire wear.  The alignment is true, and the vehicle drives nicely.
> I mostly drive highways and freeways.  I drive gently.  Only very
> occasionally on dirt roads, probably a total of 400 miles out of the
> 273,000.  Just like I did when I converted my perfectly running 1.9 to a
> 2.2 Subie engine, I tend to lean towards preventing problems when parts and
> service is "relatively" easy to do, rather than having much stress in 5-10
> years from now.  Plus, the enjoyment of a stronger ride.
>
> Was wondering if you had any words of advise?
>
> Thanks,
> RichSan Diego
>