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| | | Forums66 Topics128,033 Posts1,055,531 Members48,425 | | 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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| | | | Joined: Oct 2008 Posts: 88 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2008 Posts: 88 | I changed the speedometer out in my 62 a while back. The original read the proper speed(before it decided to retire). I ordered a new one and it reads 10 MPH slower. My question is this... inside the old unit there are two gear shafts that still look like new. I wonder if I could put those in the new spedometer to correct the problem or if I just have to live with it? Any help from the wise elders would be greatly appreciated. | | | | | Joined: Mar 2005 Posts: 98 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 98 | maybe the speedo gears in the tranny was calibrated for an incorrectly working speedo at one point in the past
50 chevy 3100
| | | | | Joined: Aug 2005 Posts: 277 'Bolter | | 'Bolter Joined: Aug 2005 Posts: 277 | Changing the gears in the speedometer should not change the way it reads. Should be the same. All old GM speedometers with the exception of 65-69 corvairs (if there are others, chime in) are geared to work with 1000 revolutions per mile input. With the speedometers all the same, changes were made in the gears in the trany. It is possible, however, that one of the two speedometers was not correctly calibrated. | | | | | Joined: Oct 2008 Posts: 88 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2008 Posts: 88 | I had a feeling that was going to be the case. Thanks for the help | | |
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