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Click on image for the lowdown. 
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| | | Forums66 Topics128,021 Posts1,055,346 Members48,420 | | 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!
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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: Oct 2006 Posts: 4,983 Master Gabster | | Master Gabster Joined: Oct 2006 Posts: 4,983 | The major difference between the 3600 and the 3100 series is the back half. The rear rails are 11 inches wider in the 3100. Other than being a bit heaver steel (I've been told) the rest of the frames are alike. There should not be any difference that would affect an MII installation. My IFS was not a problem and I wouldn't think yours would be either. http://good-times.webshots.com/photo/2838852770099708909cIMZol
~Jim
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