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Old 05-11-2009, 10:33 PM
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What speedo gear do I need??

Hey guys , I'm returning my 79 T/A to the original automatic transmission state & have a speedo gear issue I need to resolve. I am putting a TH-350 back in the car ( from the Wife's T/A...now I owe her one ) but I have purchased a new set of 17x9 wheels for the car also , the tire size ( I'm pretty sure I'm going to use unless I can go a little wider and a tad taller ) is 245 x 45 x 17. The rear end ratio is 3.73. Are the auto gears color coded like the manual gears? I used a RED gear with the 4-speed and original 15" tires. I don't need any speeding tickets!!! Thanks ahead for any input.

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Old 05-11-2009, 10:54 PM
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Here's a site to help.

http://moldyrabbit.com/liquid/speedo_gear.html
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Old 05-11-2009, 11:08 PM
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Originally Posted by crownver



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Old 05-12-2009, 04:32 AM
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Another Speedo Gear Chart. > http://novaresource.org/speedo.htm
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Old 05-12-2009, 10:15 PM
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Originally Posted by SSedan64
Another Speedo Gear Chart. > http://novaresource.org/speedo.htm



Thanks SSedan64!!
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Old 05-13-2009, 10:52 PM
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not sure if you knew or not already but if you wan to check real quick to see how far off your speedo is, or just to check it, run the car at 60mph on the dot and use a stop watch to time how llong it takes to get from one mile marker to the next


if its off by only a couple seconds then i wouldnt worry about it,

as that is a couple mph difference from dead-on

no biggie really.

good luck!
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Old 05-13-2009, 11:04 PM
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Quote:
Originally Posted by fast68
not sure if you knew or not already but if you wan to check real quick to see how far off your speedo is, or just to check it, run the car at 60mph on the dot and use a stop watch to time how llong it takes to get from one mile marker to the next


if its off by only a couple seconds then i wouldnt worry about it,

as that is a couple mph difference from dead-on

no biggie really.

good luck!

Thanks Fast68!!
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