Monteros in the US were AT only after 96. I have the parts accumulated to swap a 96 MT setup into the 00. In planning this with OldColt, he does not think we will have any issues with the ECU. This doesn't exacly answer you question though. I could get you the Fed MB number for my 00 AT if you need.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com