Note to all 39-48 owners with the vacuum shift:
a. You don't need the "clam-shells" or the rubber boot.
b. Why? They were developed to help prevent premature wear of the piston and linkage from road dirt and grime. There were a lot of dirt roads back then. There are relatively few nowadays.
c. If it is convenient, put them on. If not, leave them off. The vacuum shift will last a long, long time without them in place and work just as well without them.
d. If you have a show car, by all means, put them on (both "clam-shells and rubber boot).
You're welcome,
Charlie
BTW: I submitted this once. Don't know where it went.