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Discussion Starter #1
Hi All,

I have a 2017 Z71 crewcab long bed Duramax. Found out my drivers rear shock is leaking after 23K miles. I’ve done some searching on here and on “Fans” and the recommendations seem to be for lifted trucks or off-road duty. I don’t go off-road with the truck, all on-road with some short distance towing (#5500 enclosed trailer). My hitch has leveling bars and anti-sway. I’ve read that people say the Z71’s ride is harsh, I don’t find that but that could be because of the blown shock or because I’m used to driving a 1999 K2500 diesel Suburban which is extremely rough. I don’t mind spending the money for good shocks but I definitely don’t want a stiff ride. I’ve used Bilstein’s before but always on cars where I wanted a stiffer ride. I’d like a comfortable ride but I don’t want something that feels like driving on marshmallows and will float all over the road.

I see Rock Auto has KYB GR-2/Excel-G’s and Monroe OE Spectrum for daily drivers as well as Rancho RS5000X’s for heavy duty. Don’t know if anyone has opinions on any replacement shocks. If people say the stock shocks are harsh then I assume the ACDelco’s are also going to be harsh.

Thanks,
Art.
 

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I've used Rancho RS5000s, RS9000s, and Biltsteins on several trucks. Can't go wrong with any of them. I personally prefer the Bilsteins. They seems to be better material and I've never had any issues with the ride being too harsh.
 

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FWIW
swapped out the rears at 1K miles because I didn't care for the way it handled with the factory shocks. It made a nice noticeable handling difference for the positive. Did the same thing on my last truck which was a Toyota with the same results although I used Rancho RS5000 on that vehicle. On the Colorado I used RS7000.

 

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Go with Bilstein 5100s. They give you the flexibility to level your front end if you so desire. They are a little stiffer than factory and much stiffer than rancho shocks, but you get better body roll/ sway control as a trade off. If you are on road more than most days, I don’t think you can get a better riding shock for overall performance.
 

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Same vehicle type as turbodiverart above. Discovered today (left rear leaking oil) but at 50k miles. Bilsteins enroute.
 

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Discussion Starter #7
Same vehicle type as turbodiverart above. Discovered today (left rear leaking oil) but at 50k miles. Bilsteins enroute.
Yeah, what is it with that left rear shock?
 

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Bilstein are a great option.

I went with a set of Fox 2.0 shocks and have no regrets. The oem shocks are terrible, so just about any other replacement will be leaps and bounds better.
 

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Go with Bilstein 5100s. They give you the flexibility to level your front end if you so desire. They are a little stiffer than factory and much stiffer than rancho shocks, but you get better body roll/ sway control as a trade off. If you are on road more than most days, I don’t think you can get a better riding shock for overall performance.

Dan, do you know the diff between the 5100's and the 5160's? I'm not a recreational off roader, but would like good support when going up and down on rutted gravel roads, while pulling my ~6000# (fully loaded) bed hitch travel trailer (~700# combined weight of hitch trailer hitch weight). Sometimes in 4H. The description wording is written by the Bilstein sales staff, but makes it sound like the 5160's are more manly. Both are suitable for never to be lifted Colorado's like mine.

And while only tread adjacent, any easy checks on when shock replacement times have arrived? We're at ~46K, half on a variety of roads, pulling/carrying ~5/6 of GCVW. Shocks seem ok to me, but I know that I can be dulled to gradual changes.
 

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@bigoilbob I haven’t used the 5160’s but from my understanding, they are remote reservoir shocks designed for off-roading. The 5100s do not have a remote reservoir and are set from factory. In your situation, I would recommend standard 5100s and think about an add-a-leaf or airbags for towing. The add-a-leaf will make your unloaded ride much stiffer but you get an additional 750lbs of payload capacity, not to mention it serves as additional sway control when towing (that’s the route I went). IMHO, The addition of either AAL or bags will make a bigger difference than any set of shocks for your application. I certainly wouldn’t spend the additional money for remote reservoir shocks unless they were comparable in price.
 

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The 5160 is remote reservoir for extra cooling to prevent fading when the shock cycle excessively. Unless you are running a lot of rough unpaved road, you don’t need them.
 

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The 5160 is remote reservoir for extra cooling to prevent fading when the shock cycle excessively. Unless you are running a lot of rough unpaved road, you don’t need them.
Thanks RPB. Seems like sensible advice. I'm taking it.

And thank you DD as well, for your reply. I see your point, but since I don't ride that low even when fully loaded, and have never bottomed out, I'm sticking with my stock leafing. This is our only 4 wheel vehicle and my wife drives it all over without complaint.
 
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