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speedo gear #2801745 07/27/20 02:20 PM 07/27/20 02:20 PM
Joined: Aug 2003 Posts: 292 italy A antonellomopar OP enthusiast
antonellomopar OP enthusiast A Joined: Aug 2003 Posts: 292 italy	Hello have changed the rear end in my 71 383 Cuda to 2.76 gears. Using 245 60 15 tires, I have purchased a white speedo gear with 26 teeth. But speedo is about 10% too fast. If I am driving at 120 kmh, on the GPS it is a real 110 kmh. What is the correct gear that I should use? Thank you for the help

Re: speedo gear [Re: antonellomopar] #2801764 07/27/20 02:56 PM 07/27/20 02:56 PM
Joined: Jan 2003 Posts: 13,573 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,573 md	http://www.moparts.org/Tech/tech/pages/speedo.html If the speedo is off a bit then I always felt that it was around 2-3 mph per tooth. I `m sure someone here has made the calculation to answer this for sure.. Found this https://www.forabodiesonly.com/mopa...mine-speedo-gear-size-for-a-a833.413518/ Last edited by mopars4ever; 07/27/20 03:09 PM.

Re: speedo gear [Re: antonellomopar] #2801782 07/27/20 04:20 PM 07/27/20 04:20 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	going 110 & showing 120 would be 10.9% too high so you need 10.9% more teeth so you need 28.36 teeth. confirm the 110/120 then either 28 or 29. Just me I'd go 28 as it might save me from a speeding ticket. live every 24 hour block of time like it's your last day on earth

Re: speedo gear [Re: antonellomopar] #2802160 07/28/20 02:47 PM 07/28/20 02:47 PM
Joined: Jan 2003 Posts: 25,748 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,748 Rio Linda, CA	Originally Posted by antonellomopar But speedo is about 10% too fast. Is the odometer off the same amount? If the odometer is accurate but the speedo is off, the gear is correct and the speedo head is the problem. My calculations show you need a 27-tooth gear. The INTERNET, the MISinformation superhighway

Re: speedo gear [Re: John_Kunkel] #2802198 07/28/20 04:20 PM 07/28/20 04:20 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote Is the odometer off the same amount? If the odometer is accurate but the speedo is off, the gear is correct and the speedo head is the problem. agreed live every 24 hour block of time like it's your last day on earth

Re: speedo gear [Re: RapidRobert] #2802474 07/29/20 12:16 PM 07/29/20 12:16 PM
Joined: Apr 2003 Posts: 821 On the open road Hrtbkr super stock
Hrtbkr super stock Joined: Apr 2003 Posts: 821 On the open road	The magnet in the speedometer loses strength over time, that's why the charts don't always work. While outside on the turnpike They got this new hit tune Where thrills become as cheap as gas And gas as cheap as thrills

Re: speedo gear [Re: Hrtbkr] #2802616 07/29/20 06:09 PM 07/29/20 06:09 PM
Joined: Aug 2003 Posts: 292 italy A antonellomopar OP enthusiast
antonellomopar OP enthusiast A Joined: Aug 2003 Posts: 292 italy	Thank you for the advice. The speedo has about 70 thousand kilometers on it, and is in very good condition. Before I changed gears. speedo was correct.

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