Mine did the same thing. Did you get an answer for this problem? In refreance to the right front hub trying to lock in while driving in 2-high.

Get rid of the vacuum hubs and replace them with manuals as described at the beginning of this thread.

Same fix applies to SandraK.

1998 Sportage - Gone.
2004 Honda Civic Coupe.
2007 Suzuki Grand Vitara - She got it.