How are you using the truck now? Daily driver, occasional use or seldom used? Do you have another vehicle to drive if/when the 633 needs work? ( and it will ) If the truck is a second vehicle you can spare I'd say yeah, do it.
Quotes to live by:
guessing gets expensive
nothing is more expensive than a cheap BMW
Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?