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Hello,
I have the newest version of the ISS. My question is, there is a rubber O ring that just sits on the shaft. Is that suppose to slide between the cylinders or just sit on the shaft.
Wall Tool Gas Font Office supplies

You can see the rubber O-ring on the shaft but I’m not sure of what it’s purpose is.
 

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2021 Denali HD
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208 Posts
I’d guess, that once it’s installed, slide it down against other part of shaft, to help hold grease in splines?
 

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198 Posts
85126059 is latest part number for upper ishaft. See image. Easiest way to tell difference is no paint on shaft that connects to column. Ratchet Tool Wood Hand tool Nickel
 

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2020 GMC Sierra 3500 HD Denali
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66 Posts
I checked mine that has the new part number and it does not have a paint mark. Is the paint mark an indicator that it is the most recent product?
the paint mark was on the previous updated shaft that did not have the new part number. since then, there have been 2 new part numbers, Mtu Alum posted the most current one. yours is the newest
 

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the paint mark was on the previous updated shaft that did not have the new part number. since then, there have been 2 new part numbers, Mtu Alum posted the most current one. yours is the newest
Thank you. When I installed the newest one it didn’t change or eliminate the rattle. I’m at a loss with this truck.
 
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