thanks for the replies regarding the locking diff in the 2wd. Lots of people interested, but it doesn't look like anyones done it. Darrell at AA says he'll do it for $500 over the price of a rebuild; Weddle is something like $400, but their rebuild is 1200. In either case, you have to buy the locker servo and all the other stuff seperately.

Can anyone explain to me how the locking servo works, and what other parts I'll need? I looked in the Bentley, it was kinda vague. I'm assuming It's a vacuum lock, meaning I'll have to run vacuum lines from the engine to the tranny and back. Do I need a vacuum tank, too? And then some kind of servo to control the vacuum, with associated electrics running up to the dash and back? I've never seen one on a van, so the more details the better. thanks again.

 Jeff
Bisbee, AZ