What are the differences between these two ACDELCO shocks?

[abdullah_Zahra]

So, my mechanic told me that my shocks were bad and in need of replacement. I have no idea about different styles and models and features of shock absorbers. I think my 1500 suburban (2010) comes with these OEM shocks:
(540-435)
However, I found them to be way out of my budget right now and instead I found these "heavy duty" shocks on ebay, also from ACDELCO for much cheaper.

The seller insured that these would fit my vehicle as well. The only concern I am having is what could be the difference between my current shocks and these "heavy duty " labeled shocks? Why is there so much price difference? And what does gas charged shocks mean sorry, a newbie question

 

[OR VietVet]

The 540-435 is a rear shock and listed for the ZW7 RPO code. The other shock in the picture is a front shock.

You are not supplying enough vehicle info and RPO code information to be able to compare at ebay. What ACD part numbers at ebay?

The gas charged shock will have constant outward pressure to help keep the tires in contact with the road.

By the way, all shocks are listed at the very least as "heavy duty". I have never seen a shock listed as "light duty".

 

[Joseph Garcia]

Post up a photo of your RPO code sticker from the inside of your glove box, and post your VIN number. Then, we can help you identify the correct part numbers for your truck.

 

[petethepug]

You’re almost there. Get that pic of your RPO sticker and we’ll help you get it dialed in.

 

[Dustin Jackson]

That second shock simply would not mount to your Suburban, it's the wrong one. It looks like it's for a gmt400 or gmt800.

 

[Dustin Jackson]

Here is a link to a front strut: https://www.rockauto.com/en/moreinfo.php?pk=4937763&cc=1441045&pt=15174&jsn=772

Here is a link to a z71 rear shock: https://www.rockauto.com/en/moreinfo.php?pk=1253158&cc=1441045&pt=7556&jsn=795

 

[Rocket Man]

All you have to do is look at those two different shocks to see they aren’t interchangeable. The top one is the correct type of mounting, however I do not know if it’s the exact right shock for your truck. Try Rock auto and they will ask for your RPO code which is found inside your glovebox or you can enter your VIN at www.gmpartsgiant.com and get a list of them. Rock Auto has options for aftermarket or OEM, lots of choices.