I am looking at possibly purchasing a 2007 GMC sierra four-door quad cab Z 71 package. It only has about 6500 miles but has been sitting since 2011. The truck is in excellent physical condition and it starts drives shift stops. What do you think is a fair value for this truck. Anything I should be cautious of her look for? The body style is what’s called a classic body style and it has the 5.3 L engine in it.

I'd be real cautious buying a vehicle that has been sitting 13 years. Seals and gaskets can be dried up and cause lots of issues.

Not all 5.3 engines had it, but 2007 is the first year of the troublesome AFM. Also be sure the frame isn't rusted, no matter how good the body may look.

I would only offer what you could afford in total for the truck. Keep in mind all the potential repairs. Hoses. Belts. Tires. Brakes. Rear main seal. Gaskets. Exhaust.

So many things can go wrong when improperly stored.

And, you also will need to STOP the Active Fuel Management (AFM) from operating day one. That nonsense has ruined so many engines. It might be possible to turn off in the driver-controlled settings. Otherwise, you'll need a tuning shop, one with software that can overwrite the AFM operation and store a new calibration in the ECM.

I'm a big fan of the GMT800 trucks. I have two...one with 225k and another with 430k, both on the original motors. Mine are an 01 and an 03, so pre-Active Fuel Management, or AFM. Like egregore said, 07 was the first year for that stupidity, so you'll want to check and see if it's equipped with it or not. The LS motor was a rock solid design, but when GM added stuff to it to appease the politicians and meet their fuel economy standards, they introduced some parts that go bad and wipe out the cam lobes and valve train when they fail. If the truck does have AFM, you can turn it off with a tuner, but it would be better if it wasn't there at all.

If the truck is as clean as you say, I'd be happy to pay around $10k for it. Sitting that long isn't good for anything, and I'd change all the fluids, belts, and hoses, as well as the water pump because it's not if but when it will go bad. Also watch the rear main seal and oil pan gasket, as those will leak eventually too.

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Also be sure the frame isn't rusted, no matter how good the body may look.

I just went through that on a 2013.

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Originally posted by egregore:
Not all 5.3 engines had it, but 2007 is the first year of the troublesome AFM.

The OP should be good with his 2007 Classic...
The 2007 GMT800 "Classic" was a Gen3 5.3l... The GMT900 2007.5+ Gen4 5.3l was when AMF was introduced and had issues.

As others have said, I would be concerned with how long that it was sitting idle.

Be prepared to replace the brake calipers. We bought a 2013 GMC 3500 that only had 13,000 on it, and both front brake calipers were sticky and needed to be replaced. We've had other little stuff go wrong, also, like exhaust sensors and the like.

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Originally posted by gjgalligan:

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Also be sure the frame isn't rusted, no matter how good the body may look.

I just went through that on a 2013.

Reminds me of one that had no damping in the rear and constantly bounced. Getting it up on a lift revealed why: the shocks weren't attached to anything.