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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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!
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| | | | Joined: Jul 2007 Posts: 33 New Guy | | New Guy Joined: Jul 2007 Posts: 33 | I was looking into getting a speedo for my 54; I have a saginaw trans with 3:42 rear gear ratio so I know the stock speedo wouldnt work. I was wondering where I could find one that would work correctly and have the appearance of the original. I might consider just swapping out all my gauges depending on the cost. | | | | | Joined: Jun 2003 Posts: 565 'Bolter | | 'Bolter Joined: Jun 2003 Posts: 565 | Can't you use the original if you swap the gear in the tranny?
"Do not walk behind me, for I may not lead. Do not walk ahead of me, for I may not follow. Do not walk beside me either. Just leave me alone, you're starting to freak me out."
1957 GMC 150
| | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | Can't you use the original if you swap the gear in the tranny? Yes. | | | | | Joined: Jul 2007 Posts: 33 New Guy | | New Guy Joined: Jul 2007 Posts: 33 | I'm running 30.5 tall tires. What gear # of teeth would i need to change to? thanks | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | I think you need to find a correct pair of "drive" and "driven" gears for the transmission. Good luck. Or, it costs about $100 to have an adapter made. I did this after changing to a 3.55 rear-end and changing to taller radial tires - it is now within 1/2% accurate at 60 mph. Speedometer Shop I ran 4 measured ten-mile segments on an interstate at 60 mph. Sent them the average of the four measurements. | | |
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