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Veteran
Posts: 174
Location: Camptown PA | I have a 60 Dodge Dart Convertible with the orginal torqueflite and rear. I am running 215 75 R14 tires (26.7" diameter). The speedometer is reading 6 miles per hour higher than the car's actual speed. Will the speedometer gears from a newer torqueflight fit the 60 trans or did ma Mopar change the housing? Thanks |
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Expert
Posts: 1223
Location: Ramona, CA | The part numbers are different between my 1960 and 1964 parts books. Looks like they changed in 1962 when they went to the aluminum Torqueflite.
(speedo_pinions.jpg)
Attachments ---------------- speedo_pinions.jpg (122KB - 134 downloads)
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Expert 5K+
Posts: 7207
Location: Victoria, BC, on Vancouver Island, Canada | One of the factors that your speedometer is registering high is the fact that your 215-75R14 tires are too small. The overall height of those tires is about 3" less than the original 800 x 14's the car used. It might not be 6 MPH but it could easily affect it by about 3 mph from different sized tires I've used. |
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Board Moderator & Exner Expert 10K+
Posts: 13055
Location: Southern Sweden - Sturkö island | The speedometer cable changed in '62 and the new generation of gears cannot be used on the older gearboxes.
There's only a slim chance that you'll find a speedometer gear that will correct the error on the speedometer.
If you will keep your tire dimension, then a gauge repair shop could calibrate your speedometer instead. |
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Expert
Posts: 3575
Location: Netherlands | Speedometers are off by a percentage, not actual mph.
If it's reading 6 mph too fast, you need to specify at which (real) speed this is.
Say, at 60mph (gps), a speedo reading 6 mph fast is 10% too fast. You'll need a transmission-speedo gear that has 10% more teeth.
That same speedo will read 12mph too fast at 120mph, or just 3mph too fast at 30mph.
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Veteran
Posts: 174
Location: Camptown PA | Thanks for the info |
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Expert
Posts: 3780
Location: NorCal |
I never rely on the speedo to determine the correct pinion. The odometer is direct-geared and is a much more accurate than the spring-loaded speedometer.
I recently had the speedo in my '57 checked by a commercial speedometer shop and the error was greater at low speed. |
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Expert
Posts: 3575
Location: Netherlands | Speedo-correctness is easy enough to check these days with the GPS in your smartphone and one of the plentyful speed-measuring apps.
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Veteran
Posts: 174
Location: Camptown PA | Speaking of odometers - the numbers on my odometer are below the cutout. To read the numbers, I have to get my head above the speedometer and look down. I removed the trim and could not find a way to get the numbers centered - any ideas? |
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Expert
Posts: 3893
Location: Northen Virginia | I checked my speedometer some years ago with my Garmin GPS, and I did a video of the very accurate readings ..Theses are pictures frames of the video..
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Attachments ---------------- 37.jpg (55KB - 143 downloads) 53.jpg (63KB - 136 downloads) 64.jpg (79KB - 153 downloads) 74.jpg (25KB - 129 downloads) 94.jpg (64KB - 145 downloads)
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Expert
Posts: 1223
Location: Ramona, CA | My 300F speedo is very accurate as well. I didn't check the odometer though. |
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