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speedo speedometer gear sources |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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Posted: Aug/13/2019 at 10:52pm |
i need a 20-tooth gear for a T96. is this "Ford type"? looks like one. couldn't find a previous post on this.
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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rodhhrod
AMC Addicted Joined: Jul/11/2010 Location: Oregon Status: Offline Points: 1040 |
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Amark has some.
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3498 |
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I have personally used these gears. If you are sure a 20 is all you need, you can find just those on eBay also. https://www.ebay.com/itm/Ford-SPEEDOMETER-GEAR-Set-of-5-Mustang-Fairlane-Ford-Transmissions-NEW/223464974493?hash=item34078ce89d:g:CvgAAOSws1FaxFvM:sc:USPSFirstClass!15044!US!-1
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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thanks! yeah there's supposed to be 20-tooth in there, but for soem reason it's 18, so 50 mph actual reads 63 to 65. i suppose that's one way to save gas... |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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FritzF3
AMC Apprentice Joined: Sep/12/2018 Location: 52316 Status: Offline Points: 112 |
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Scott,
Is there a chart that shows you which speedo gear you should have? Fritz
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5905 |
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FritzF3 - what year make and model of car ?
What Transmission, Rear End Gear Ratio, and Rear Tire Size ? Depending, the "objective" is probably 1,000 Revs Per Mile on your Speedometer Cable at the Speedometer Head in the dash.
I like to do the math calculations long hand myself just to compare to the TSM Chart There -IS- a Chart in the back of Chapter 4 Electrical, in the 1969 AMC Factory TSM Technical Service Manual. tomj - did you check with any local Transmission Shops in your area for a speedometer gear ?
Edited by PHAT69AMX - Aug/15/2019 at 3:42pm |
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scott
AMC Addicted Joined: Jul/10/2007 Location: Wildwood Pa. Status: Offline Points: 3498 |
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Fritz, the best way to get an accurate speedo reading is to use a GPS speed &
what shows on the speedo to calculate the percentage of error. Do this
at the speed you want it to be most accurate. Then pull the driven gear,
count the teeth, then change the tooth count by the percentage of
error. Add teeth to slow it down, subtract teeth to speed it up. This
gets it as close as it is going to get without swapping lots of gears
& hoping.
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FritzF3
AMC Apprentice Joined: Sep/12/2018 Location: 52316 Status: Offline Points: 112 |
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Scott,
Thanks for the info. I'll definitely use that when we get the AMX back together. Fritz |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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huh? no! that would have been SENSIBLE! it's nearly two miles away! i visualized one, burned incense, and said OMMMMM.... i'm sure one will arrive soon. i was buying stuff from Summit so i added one to the order. one or the other will appear just as i need it... think good thoughts for me. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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tomj
AMC Addicted Joined: Jan/27/2010 Location: earth Status: Offline Points: 7522 |
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fritz: what scot says. i find it easiest to use the Android app DigiHUD (or something like it) that has a resettable trip odometer. GPS is accurate in a straight line, less so on twisty roads. one way to do this is to drive down a freeway (few turns), when your in-dash odo rolls to some easy number (xxxx99.0 etc) reset the GPS trip odo. drive 10 or so miles, doesn't have to be a round number. pull off and stop. subtract the original odo (xxxx99.0) from the current reading, for "indicated" elapsed miles. divide the larger number (GPS trip odo, or your speedo odo) by the other number. it'll be 1.xxx fraction. 1.12 is 12%, etc. that's the percent error. *** if the trip odo is LARGER, your speedo is reading low, the gear is too large: reduce by the error percentage. *** if the trip odo is SMALLER, your speedo reading is high, the gear is too small; increase tooth count by the error percentage. round to the closest whole number. |
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1960 Rambler Super two-door wagon, OHV auto
1961 Roadster American, 195.6 OHV, T5 http://www.ramblerLore.com |
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