Welcome to ClassicBroncos! - You are currently viewing the forums as a GUEST. To take advantage of all the site features, please take a moment to register. It's fast, simple and absolutely free. So please join our community today!
If you have problems registering or can't log into your account, please contact Admin.
I currently have a "white gear", 19 tooth, but changed from 28" tires to 33" tires, Speedo off now.
65HPH (actual by Waze satellite) is reading 73 MPH on speedo. do I need to go up in tooth count?
Yes, up the tooth count on the cable side. That slows the cable down.
19 tooth and still reads slower than actual, you must have some steep gears in it.
Something isn't correct. Should be no way to get speedo close to correct (within 10 percent) with 3.50 gears and 33" tires. A 19 tooth driven gear should be closer to 20 percent off. I'm going to say something wrong with the drive gear in the tcase or cable or speedo itself.
At about 60MPH. Important detail. As being off by 5MPH at only 30 would be twice the error.
More correct, the error is a percentage error. If the tire size or gear ratio changes 10%, the speedometer error is also 10%. Not a fixed offset error.