Click the link for the parts and illustration book you want.
The download link on the page that opens in a new tab or window is the green rectangle that says download.
You need Adobe Acrobat Reader or one of the many clones to open PDF files.
GMPartswiki.com has my scans of the parts books but they are a page at a time.
Here's the 85-91 tilt column illustration page.
http://gmpartswiki.com/getpage?pageid=57036
Click on the page links in the upper corners to go forward and backward in the book.
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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.