Most likely its your tires. Could just need balanced. Or you might have uneven wear making it shimmy.
Out of balance tires, bad u joints, out of balance drive shaft, out of balance wheels. Gremlins.
The EPA range estimate for the 2007 GMC Yukon is 364 mi. in the city, 494 mi. on the highway.
The EPA range estimate for the 2004 GMC Yukon is 364 mi. in the city, 468 mi. on the highway.
The EPA range estimate for the 2014 GMC Yukon is 390.0 mi. in the city, 546.0 mi. on the highway.
The EPA range estimate for the 2013 GMC Yukon is 390.0 mi. in the city, 546.0 mi. on the highway.
The EPA range estimate for the 2008 GMC Yukon is 364 mi. in the city, 494 mi. on the highway.
The EPA range estimate for the 2015 GMC Yukon is 416.0 mi. in the city, 598.0 mi. on the highway.
The EPA range estimate for the 2003 GMC Yukon is 338 mi. in the city, 442 mi. on the highway.
The EPA range estimate for the 2011 GMC Yukon is 390 mi. in the city, 546 mi. on the highway.
The EPA range estimate for the 2010 GMC Yukon is 390 mi. in the city, 546 mi. on the highway.
The EPA range estimate for the 2012 GMC Yukon is 390 mi. in the city, 546 mi. on the highway.
The EPA range estimate for the 2002 GMC Yukon is 338 mi. in the city, 468 mi. on the highway.