The 2004 GMC Yukon XL 2500 is available as a 4-door, 9-seat sport utility. Starting at $40,010, the 2004 GMC Yukon XL 2500 SLE 4x2 is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2004GMCYukon XL 2500SLT 4x4 , priced at $ 42,710 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated