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**Boog** · 07-05-2015, 12:48 PM

I am looking at an 09 GMC Yukon 4wd for the wife. It has good options. It has listed "shiftable automatic" trans. I see it has a + and - on the shift lever.
What trans is this and what does this on the shifter do?
Any quirks to be aware of with the 09's?
Hp? MPG?
What denotes that 4 to 8 cylinder derate deal? The dealers don't always list every option on the window sheets of used vehicles and sometimes they are wrong in their ads too.

07-05-2015, 12:48 PM	#1
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 12,996	09 Yukon I am looking at an 09 GMC Yukon 4wd for the wife. It has good options. It has listed "shiftable automatic" trans. I see it has a + and - on the shift lever. What trans is this and what does this on the shifter do? Any quirks to be aware of with the 09's? Hp? MPG? What denotes that 4 to 8 cylinder derate deal? The dealers don't always list every option on the window sheets of used vehicles and sometimes they are wrong in their ads too. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross