Montana AWD & 3023
Checkedthe GM site and the followingis listed for the 2005's
Trailer Towing Package - 1588 kg (3500 lb.) capacity, includes touring suspension, heavy-duty radiator and transmission oil cooler, trailer wiring harness, heavy-duty signal flasher and higher output alternator (does not include hitch; includes automatic rear level control suspension and accessory inflator kit)
Looks like I already have the transmission cooler - I will check the manual. The 2004 AWD has 3600lb towing capacity.
John
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