I just replaced all shocks on my 04 Hoe, the rears I bought from Rock 580-354 were 3 " shorter than the ones installed from a previous owner. The only label readable was a partial Tenneco which I found out was Monroe. The previous owner changed some things but now I am finding this shock issue...
I just found this site for a new GM museum https://www.gmheritagecenter.com/ under archives you can find truck information complete with RPO codes. Lots of good info just nothing new, and all models which is nice.
Cheers
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