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Old 11-25-2013, 08:48 AM   #11
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So I'm seeing that there really isn't a big difference real world driving wise between the AFM motors and one without it.
Again my concern is mpg for daily driving.
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Old 11-25-2013, 08:59 AM   #12
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You'll see the difference in the 6 speed over the 4 speed more so than you will in the AFM vs no AFM. 09+ trucks with the 5.3 or 6.2 will have the 6l80e transmission, which completely changes the way they drive. Much more get up and go when you're towing because of the lower gear ratios achieved.

FWIW, I average about 17 mpg with a 60 highway/40 city driving 65 on the highway (with 33" tires, 2" level kit, recalibrated speedo). On a long trip only highway, I can get 22. On my 2005 Sierra with 5.3 and 4 speed trans, 19 was the highest I ever got on a highway only trip. And these are hand calculated, not DIC numbers.
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Old 11-25-2013, 09:36 AM   #13
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6.0 Silverado

Our 2001 2500HD 6.0 Gas Silverado Ext. Cab with 160K on the clock, has been pulling our Sunnybrook TT (8840) for many years and when we moved up to a Crusader 270RET (8890) fifth wheel, our gas mileage stayed at 12 when pulling. Around town we usually average around 16/18. We have had the truck dyno's and some shift points changed and now should get much better.


Quote:
Originally Posted by lanefj40 View Post
We just bought a 09 Grand Surveyor. Loaded we will be around 6000 lbs. The previous owner towed with a Mercury SUV v8.
I'm looking for used Silverados and Ecoboost Fords.
Tell me about motors, I'm looking at a 07 with a 5.3 OHV 16V FFV motor.
I've talked with a guy I know who has an 09 and he's telling me he's getting 20 plus mpg highway (not towing) and high teens around town. His is the motor that adjusts how many cyls are active to give the better fuel economy. Ideally I would like this motor as the truck will be my daily driver and I need to get the best possible mpg.
Whats this motor called?
What year did it become an option in the Silverado?

Thanks
Lane
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Old 11-25-2013, 09:58 AM   #14
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Is there a data plate somewhere that will tell me the axle ratio?
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Old 11-25-2013, 10:05 AM   #15
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In the glovebox, there is a sticker with RPO codes listed. These codes tell you which gear ratio you have (and if you have the locker in the back):

G80 : AXLE POSITRACTION, LIMITED SLIP
GU4 : AXLE REAR, 3.08 RATIO
GU5 : AXLE REAR, 3.23 RATIO
GU6 : AXLE REAR, 3.42 RATIO
GT4 : AXLE REAR, 3.73 RATIO
GT5 : AXLE REAR, 4.10 RATIO
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Old 11-25-2013, 10:05 AM   #16
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Probably not, may just have to put something of the Silverado website, think there are only two, 3:73 or 4:10, we have the 3:73....
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Old 11-25-2013, 10:45 AM   #17
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I had thought of retro fitting a 6l80e into my 2002 1500HD to help the fuel mileage, but after talking to 3 different friends in the auto & transmission business, they talked me out of it. They all say the 6l80e GENERALLY will fail between 80 -100,000 miles.
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Old 11-25-2013, 11:34 AM   #18
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Quote:
Originally Posted by lanefj40 View Post
We just bought a 09 Grand Surveyor. Loaded we will be around 6000 lbs. The previous owner towed with a Mercury SUV v8.
I'm looking for used Silverados and Ecoboost Fords.
Tell me about motors, I'm looking at a 07 with a 5.3 OHV 16V FFV motor.
I've talked with a guy I know who has an 09 and he's telling me he's getting 20 plus mpg highway (not towing) and high teens around town. His is the motor that adjusts how many cyls are active to give the better fuel economy. Ideally I would like this motor as the truck will be my daily driver and I need to get the best possible mpg.
Whats this motor called?
What year did it become an option in the Silverado?

Thanks
Lane
We have an 05 1500 Silverado Ext. Cab with 5.3L and a 3.23 rear end and tow a 12 Flagstaff 8528RKWS with no problems. I do have air bags installed. The truck dropped about 1-1/2" with the trailer and 25# of air and it was back to normal height. I have the extended shackles on the rear so the truck sits level without the trailer.
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Old 11-25-2013, 11:48 AM   #19
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Quote:
Originally Posted by LKicklight View Post
Probably not, may just have to put something of the Silverado website, think there are only two, 3:73 or 4:10, we have the 3:73....
I just looked it up on Chevy's website. They list a 3.08, 3.23, and 3.42. The 3.73 is available with the Max Trailering package.

From what I hear, the gearing in the six speed allows for the higher rear end gearing.

Quote:
Originally Posted by mfdrookie516 View Post
In the glovebox, there is a sticker with RPO codes listed. These codes tell you which gear ratio you have (and if you have the locker in the back):

G80 : AXLE POSITRACTION, LIMITED SLIP
GU4 : AXLE REAR, 3.08 RATIO
GU5 : AXLE REAR, 3.23 RATIO
GU6 : AXLE REAR, 3.42 RATIO
GT4 : AXLE REAR, 3.73 RATIO
GT5 : AXLE REAR, 4.10 RATIO
I found a GM master RPO list somewhere...it is your friend when shopping used for a TV. Wish I'd had it the last time I went truck shopping because the dealership couldn't tell you (or won't).
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Old 11-25-2013, 12:40 PM   #20
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Quote:
Originally Posted by raspivey View Post
I found a GM master RPO list somewhere...it is your friend when shopping used for a TV. Wish I'd had it the last time I went truck shopping because the dealership couldn't tell you (or won't).
This is the one I use... I know a lot of them by memory, but the ones I don't can be easily looked up - GM-Trucks.com | RPO Code Lookup
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