2014 gmc yukon review this car review is specific to this model, not the actual vehicle for sale. The gmc yukon has a fresh and comfortable interior. Available in 2wd or 4wd and in three trims, the yukon seats up to nine passengers and is rated to tow up to 8500 pounds when equipped with the heavy-duty trailering package on the 4x2 model. The sle and slt trims both come with a standard 320-hp v8 5. 3-liter engine which is e85 fuel compatible and coupled to a an efficient six-speed automatic transmission. The 2wd or awd denali trims come with a standard 403-hp 6. 2-liter v8 which is e85 fuel compatible and coupled to an efficient six-speed automatic transmission. For 2014, the gmc yukon has some exterior paint changes and the optional convenience package is now standard equipment on the sle trim. Anti-lock Brakes