I, too, have no experience on this area of the van.
But prior to tackling this job I did a search of the
archives for upper control arm bushings(UCAB). As
expected there's a wealth of info.

SYNOPSIS:
It seems that the change of UCAB does not guarantee
the removal of front end squeaking. The r/r will take
away the knocking about caused by the delamination of
the internal rubber of the bushings. The Bentley says
to spot weld the new ones in and most agree that this
is necessary (some don't, though).
Most also agree that this the perfect time to do the
ball joints and tie rod ends, too.  I have put off
doing my UCAB until I get all the other parts to do it
completely.  I don't have the squeaking...mine is
knocking about.

HTH someone.
Stephen
Chillicothe OH

__________________________________
Do you Yahoo!?
New and Improved Yahoo! Mail - 100MB free storage!
http://promotions.yahoo.com/new_mail