The 2008 GMC Yukon XL 2500 is available as a 4-door, 7-seat sport utility. Starting at $43,175, the 2008 GMC Yukon XL 2500 SLE w/3SA 4x4 is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2008GMCYukon XL 2500Commercial Fleet 4x4 , priced at $ 43,175 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated