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Old 07-05-2015, 12:48 PM   #1
Boog
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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.
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69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
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91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.

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Old 07-05-2015, 07:00 PM   #2
clinebarger
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Re: 09 Yukon

6L80E 6 speed. You can put the Shifter in "M" & Tap shift the Trans.

Got the 8th digit of the VIN?
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Old 07-05-2015, 10:02 PM   #3
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Re: 09 Yukon

No sorry I don't have the vin. I am pleased to see it doesn't have that electronic control rear suspension thing though.
I also stopped to look at a Tahoe and as soon as I saw it had that option I turned around and left.
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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
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Old 07-06-2015, 12:07 PM   #4
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Re: 09 Yukon

The 8th digit of the vin is 0.
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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
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Old 07-06-2015, 04:02 PM   #5
95 S_Trucker
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Re: 09 Yukon

That decodes to RPO LMG.

5.3, flex fuel, iron block, cylinder deactivation.

That should answer your question about 8 cyl to 4 cyl.

Some have oil consumption issues. Some people will get a tune to keep it from going to 4 cyl mode.
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Old 07-06-2015, 07:03 PM   #6
clinebarger
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Re: 09 Yukon

You can put it in "M" And Tap Shift up to 5th, This will lock out 6th gear & Keep the engine from dropping cylinders.
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Old 07-06-2015, 09:53 PM   #7
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Re: 09 Yukon

Yeah, I was afraid of that. It looks like we're going to get more serious about it. It's a real nice Yukon.
I'm afraid to ask but. Do these trans hold up well?
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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
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