I would keep working on your dealer. As I recall, I was able to get my dealer down to around $265. He said I was basically getting it at cost as he had personally seen several vehicles come thru their service dept. with the same problem. Ask your parts guy to see what his cost is!!

1994 3.0L 4x4 pickup.
4.62 gears (4.22 stock), 33x10.5 BFG MTs. LSD rear. Five speed trans. 172K
Previously owned Mitsubishis:
1986 2.6L 4x4 Mighty Max, 1985 2.6L 4x4 D50
1987 2.6L Raider, 1989 3.0L Raider
1995 Montero SR