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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: Nov 2010 Posts: 339 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 339 | On my speedo, at 65mph, GPS reads 57mph do I live with it or change something or get adapter? 53 3100 235 4 speed 3.73 rear 235x75x15 tires. root | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | Since your rearend ratio has been changed, the error will be different at different speeds. I would take a number of different readings at different speeds and then decide if it something that can be lived with. You can buy an adapter to correct for the error if you know what it is. | | | | | Joined: Nov 2010 Posts: 339 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 339 | Thanks trucker, yes at 30 its 30 at 45 its 41 at 55 its 48 and at 65 its 57. So I think I will live with it. root | | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | It looks like you are about 14% low so if you have an adaptor made to increase the cable speed by 1.14 all of your ranges will be very close. This ebay seller custom makes GM adaptors... http://www.ebay.com/itm/Speedometer-Ratio-Adapter-GM-Chevy-/272216365964?hash=item3f615c1b8c:g:yUEAAOSw~oFXFSdk&vxp=mtr Mike B  | | |
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