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Click on image for the lowdown. 
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| | | Forums66 Topics128,121 Posts1,056,328 Members48,439 | | 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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | Like Spanky said, read what we posted on the Old GMC site. Your code S-7544. These two pages are the information I cited on the GMC site. https://plus.google.com/u/0/1126369...3451166626&oid=112636930370126476644You will have to find a shift fork for an electric box in order to change from either air or vacuum on an Eaton 17500. | | |
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