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Old 03-11-2013, 12:12 PM
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Speed wrong on speedometer

I have a rebuilt 350 turbo transmission in my 1952 street rod truck. I have an after market speedometer. I had a friend give me a new nylon gear he said fit the transmission. The speed is way to high on the speedometer as I drive. Are there different nylon gears that fit the 350 turbo. At the speedometer going 70 mph I'm actually going 55 mph according to my GPS.

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Old 03-11-2013, 12:17 PM
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speedo

how about trying or calling a trans shop and see what they recommend for gearing..
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Old 03-11-2013, 01:28 PM
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I have the same problem that I still havent gotten around to fixing. Th350. 3.73 gears in the rear. Someone posted a link to a site that has a calculator to figure out which gear to use if i remember correctly. I lost the link when I formatted my PC. I'm going to try and find that. If I can ill post the link.
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Old 03-11-2013, 06:53 PM
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Get a ratio adaptor to correct it.
Look here.
Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4
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Old 03-11-2013, 07:07 PM
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PATC website also has speedo calculator /correction calculator if you search it out. Better to just get the correct drive/driven gear and fix it right. IMHO
Mine has a 3.08 15 tooth drive 36 tooth driven 26.4 inch rear tires . It is spot on.
Most speedos record 1 mile at 1000 revolutions. FYI
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Old 03-11-2013, 07:32 PM
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turbo 350 is 1:1 in 3rd gear
You have a 3.73 rear.
Need to know your excat tire diameter on rear, or at least list the size.
with those 3 pieces of information you can figure which gears to buy and install.
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Old 03-11-2013, 08:00 PM
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Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4
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