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| | | Forums66 Topics128,164 Posts1,056,966 Members48,458 | | 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
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | Working on my 55 and 58 2-tons. (model 6400) the vacuum diaphragm actuator for the speedometer adapter is shot. Does anyone make replacement diaphragms, or do you modify a vacuum advance module to activate it or what is the fix? | | |
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