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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,070 Posts1,055,892 Members48,428 | | 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!
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#90536 09/05/2004 3:44 AM | Joined: Jul 2003 Posts: 586 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 586 | I would guess and say it is probably your
rear tires. When the speedometer was made, it
was set for a certain diameter size tire.
You can check on the factory stock size and
compare it to what your running. Also, if you
changed you tranny or rearend, this will
affect the speed indication too. | | |
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