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Click on image for the lowdown. 
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1 members (baldeagle),
43
guests, and
5
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | acmegarage,
That's the 'belly-button' switch...
"I"= inney
"O"= outey
Could it possibly be a button IN/OUT for 4WD or Quadratrack?...a non-installed option on your truck!
Stuart | | |
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