You will find most of the stock specs in the GM Herritage archives.
The direct link to the pfd doesn't always work so you have to do a bit of step by step work to get there but they have most years of trucks in the truck section.
https://www.gmheritagecenter.com/
Open the page.
Then go over to Archive and click on Vehicle information kit on the drop down.
The next page will have some options including Chevy Truck (no GMC pages)
Click on Chevy truck and a page opens up listing all the available pfd selections.
Scroll down to the right year and open it and then scroll though the pages to wheels.
On an original truck question many of the answers guys give come from checking those pages to get the answers.