They seem to be OK. All of them download and open in Adobe Acrobat Reader 9.5
Click the links and they'll open a Mediafire page... Right click the green "Download (xx.xxMB)" button in the upper right and save the PDF file.
These were created with Adobe Acrobat 9.5 so they shouldn't have artifacts that keep them from opening with other readers...
Foxit for Linux/Android/IOS/Windows or
Skim for Mac OS are the first ones I can name off the top of my head. There are lots of good and not so good lightweight PDF editors and readers if Adobe is too bloated to play well on your system.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.