Any decent mechanic or air conditioning shop can shift your a/c from freon
to R-134.  It is not necessary to go tho the dealer!  You may want to get a
new receiver/dryer, especially if your a/c has had a freon leak for some
time.  Note that standard receiver/dryers will work okay if you can find one
that has the correct physical dimensions and appropriate placement of hose
connections.

I had this done last summer on my 86 Syncro and have been totally pleased
with the results.

Budd Premack
86 Syncro, 84 GL(for sale soon), 73 Super
Minneapolis, MN (Land of Sky Blue Waters)