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Click on image for the lowdown. 
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| | | Forums66 Topics128,089 Posts1,056,139 Members48,435 | | 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: Apr 2007 Posts: 1,038 'Bolter | | 'Bolter Joined: Apr 2007 Posts: 1,038 | The diaphragm part number is 3847058. This part was used on early 70's trucks and thus can be still obtained at GMC parts departments. You may have to ask them to use their obsolete parts locater computer. I was able to get a brand new one from a GMC truck center in Phoenix.
Kent | | |
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