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post #1 of (permalink) Old 02-14-2002, 03:14 PM
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Speedo Gear....?

Hey guys,
Anyone of you guys know where to buy speedo gears from? Also, does anyone know how to figure out what gear you need, I know there is a formula for it but I can't find! I have 35's, 4.56, and auto tranny. Thanks Jake

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post #2 of (permalink) Old 02-14-2002, 03:36 PM
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Re: Speedo Gear....?

I think that if you call a dealership they will be able to get you the size of the gear you need, and I think that they can get the actual gear also. However, you need to find a dealership that has people who know what they are doing. Some don't. (I hate when someone who has no idea what they are talking about tries to tell me somthing that I know is not correct, but they think that because they work for a dealership, that makes them right all the time)

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post #3 of (permalink) Old 02-14-2002, 06:00 PM
 
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Re: Speedo Gear....?

Don't use a formula. Your 35" tires are not actually 35" tall and other inaccuracies. You want it closer than that. Simply measure your speed or distance accurately and compare to your odometer or speedometer. If your speedometer is reading high, because you installed numerically higher gears, you need a larger speedometer gear to slow it down. Count the number of teeth on your present gear, and proportion it up (slow the speedo reading down) or down (increase speedo reading) based on the ratio of your current readings to the actual readings. For instance, Your speedo reads 60 but you are actually going 70 because you installed 35" tires. You need to speed it up by installing a smaller speed drive gear. multiply the number of teeth on your present gear by 60/70. You can get the gears from chrysler dealorships. If it was the other way around, the speedo reads too high (you just installed 4.88 gears) then you need a larger speedo gear by 70/60 times the number of teeth on the present gear.

On the other hand, the chart may be right, but at say $20.00 a pop.... your choice.


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