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Click on image for the lowdown. 
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| | | Forums66 Topics128,035 Posts1,055,559 Members48,426 | | 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: Nov 2010 Posts: 339 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 339 | Does the speedometer drive just screw into the SM420, if so does it come out easy? I have a speedometer that jumps around a lot but I think its the speedo head itself. but thought I would check the gears on the drive to make sure. 53 3100 root | | |
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