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OEM Shocks with Z71?

OEM Shocks with Z71?

Postby Glens09 [OP] » Nov 06 2011, 5:53pm

What brand are the 2009 OEM shocks if the Z71 package was selected? I have the Z71 suspension system, but the shocks are just plain black with no brand name that I can see. I have read that, at least on the newer trucks with Z71 the shocks are Rancho's. But I always thought that Rancho's are white with a red neoprene boot. Any help would be appreciated.
TIA.
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Re: OEM Shocks with Z71?

Postby country1911 » Nov 06 2011, 6:34pm

Not sure about the newer trucks, but on the older ones I think they are bilstein.
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Re: OEM Shocks with Z71?

Postby Z71Silvy » Nov 06 2011, 7:53pm

Same with my 2011 - no rancho's
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Re: OEM Shocks with Z71?

Postby lowrider » Nov 06 2011, 11:35pm

Ranchos only came with the Z71 appearance package.

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Re: OEM Shocks with Z71?

Postby Z15 » Nov 06 2011, 11:56pm

Z71 option use Tenneco except for the GMC All Terrain and Chevy w/Z71 Appearance pkg have Rancho.

Rancho are hard core, make a 1500 ride like a 2500. I got them on my All Terrain and man are they stiff.

btw - last year for bilstein was 1998
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Re: OEM Shocks with Z71?

Postby EKinMN » Nov 07 2011, 3:12am

I have the Rancho's on my All Terrain package. They are stiff. The truck actually rides better when I am towing my boat. That said, I knew I was not buying a limo, so I really like it.
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Re: OEM Shocks with Z71?

Postby Z71Silvy » Nov 07 2011, 4:18am

Just this weekend while visiting some family I cruised across a harvested corn field at about 40 mph, sounds like the Z71 package with normal shocks made it such a smooth ride for me, I was actually impressed how well it soaked up the bumps considering I was going across the rows. Good to know! Any idea why the Rancho's are stiffer?
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Re: OEM Shocks with Z71?

Postby chewie37 » Aug 20 2012, 1:38pm

Here I go digging up an old topic again . . .

But I have a 2011 Sierra extra cab with the Z71 RPO code. Curiosity got the better of me over the weekend and I went poking around under the truck. And have now managed to confuse myself quite a bit; hopefully someone can shed some light on things for me. The truck is still new enough that the AC Delco stickers on the rear shocks are easily readable. Here's what they say:

AAR5
OE15439
20955418

What's making me nutty is I can't find that part number anywhere - not even a cross-reference number (in case they've been replaced by a new number.) Anyone have any info on these?
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Re: OEM Shocks with Z71?

Postby Mudduck » Aug 20 2012, 4:27pm

Dam, All this time I thought I had Bilsteins. I gotta say though, my ride (all stock) is great.
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OEM Shocks with Z71?

Postby SilveradoZ-71 » Aug 20 2012, 4:29pm

Call the dealer, I'm sure the part # ha been replaced. I work at a Mack/Volvo dealership and it seems like every other time I go to get parts they change numbers 2 or 3 times. I'm sure GM does this regular also.
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