GMC with air dam removed?

bcazier · September 28, 2013

Does anyone have some pictures of this set up? I'm sure I can dig around but thought we could get a collection together for other newbys too. Did it change your mileage? I know most say it doesn't but seems like it may throw it off a few tenths

2016 Sierra Owner · September 28, 2013

Here is one members truck without the air dam.

http://www.gm-trucks.com/forums/topic/153323-first-member-with-a-denali/?do=findComment&comment=1352211

oldmann · September 30, 2013

It does change the mileage. Gm started cutting the air dams on the corvette because it would always hit driveways when you pulled in. They notice an improvement in gas mileage. So now, they do it with the trucks as well. It cleans up the air around the tires. just like the little "mud flap in front of the rear wheels on the k2000 platform.

TimmyG · September 30, 2013

Beteewn my 3body lift and removing my front airdam I lost 1 yo 1.5 mpg

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GMC-AT · September 30, 2013

think I lost about .5 MPG with just a 2in level... and air dam still in place. People are full of it when they say these engineers don't know what they are doing with aero especially.....

AgDoctor · September 30, 2013

I'm taking mine off and the stupid looking flaps in front of the rear wheels. I hate mud flaps and air dams. If I'm paying 40K for a pickup an extra half mpg won't be that killer.

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SilverBullet14 · November 18, 2014

is it hard to remove the airdam? I am looking into taking mine off.

meanjoe · November 18, 2014

is it hard to remove the airdam? I am looking into taking mine off.

To take off the lower air dam there is 18 bolts (10mm) and 4 plastic push pins that I removed with a flat - tip screwdriver. It was quite easy, just time consuming.

I am very happy with the looks of my truck now.

Edited November 18, 2014 by meanjoe

Spurshot · November 18, 2014

think I lost about .5 MPG with just a 2in level... and air dam still in place. People are full of it when they say these engineers don't know what they are doing with aero especially.....

There used to be a guy that was an old aerodynamics engineer hanging around. He may still be around on the GMT900 forums. One of the few around that really appreciated aerodynamics on our trucks. ... Ha! I said that? That's like saying aerodynamics on a barn. Well, as long as air is moving over it, aerodynamics are in the mix.

I was poking around the web one day and found an article that discussed the aerodynamic drag of the rear wheelwells of cars. It stated that up to 25% of the total drag of the vehicle can be from that area. That's huge. Focusing on that area makes sense. I suppose that's why GM put the "rear tire spoilers" on our trucks. Makes you wonder how smart the old 50's car engineers were when they put fender skirts on cars.

Libertas · November 18, 2014

This is a 2" level with air dam removed

SilverBullet14 · November 19, 2014

Nice, I removed my air dam today , 2 in. Level with 305/55/20 terra grapplers with 20in xd addicts

The picture is before I removed air dam and right when I still had my old tires in the back.

Edited November 19, 2014 by SilverBullet14

Libertas · November 19, 2014

Love that silver. I really didn't want a black truck, but this one was too good to pass up at the time.

EaZ8 · November 20, 2014

if you are taking it off bcause you think it will rip off while offroading (which is partially why i took mine off) well....

i was joking with my buddy saying the one on his 2011 Z71 would get ripped off, he said it hasnt yet....

took his truck on some sketchy trails, banged the skidplates and running boards off a few rocks, went through a lot of wash out and all kinds of other logging road and ATV trail terrain.

got back and his was still attached and not damaged...

im keeping mine off because it looks better IMO. i didnt notice much of a mpg loss on the highway if at all. i would account my MPG fluxuation more to the higher winds ive been driving through lately and using 4x4 and 4 auto a bit due to conditions.