speedo off by ????
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Old September 29th, 2008, 07:16 PM   #1
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speedo off by ????


how much do 3.73'e effect the speedo? 5 or 10mph?
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Old September 29th, 2008, 07:57 PM   #2
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its not a set amount usually the faster you go...the more it gives a false reading.
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Old September 29th, 2008, 07:58 PM   #3
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example at 35 mph your speedo will probably be somewhere around 42-45 mph.....but when your at 60-70 mph your speedo will probably read about 80-90 mph
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Old September 29th, 2008, 08:05 PM   #4
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i know that i can buy new gears for the tranny but is that going to put me on for sure?
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Old September 29th, 2008, 08:25 PM   #5
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its just a small plastic gear...that pops in the side of the tranny. and yes it'll put you fairly accurate, i mean keep in mind that we're talking about a 18 year old vehicle so the speedo...probably isn't 100% as it is anyway.
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Old September 29th, 2008, 08:52 PM   #6
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does ne one know the number of teeth gear i need for 3.73's? i know stock is 18 teeth and i heard its 5mph a tooth????
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Old September 29th, 2008, 09:05 PM   #7
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ok first thing's first... if you have a 91 trans (i'm gonna assume t5) then changing the driven gear on the sender isn't going to fix it.. the most you can re-calibrate for is 3.55... this is assuming you still have the stock 8 tooth spedo drive gear in there.. yoiu will need a 6 tooth drive gear with an 19 or 20 tooth driven gear i believe.... just call up any aftermarket parts co. for example, call "latemodelrestoration" they have bad ass phone support, and they'll get you both gears that you'll need... but you have to also take into account your tire size...
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Old September 30th, 2008, 01:22 AM   #8
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Originally Posted by 91cobra5.0 View Post
does ne one know the number of teeth gear i need for 3.73's? i know stock is 18 teeth and i heard its 5mph a tooth????
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Speedometer Recalibration Gears - '79-'98 Ford Mustang
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[QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]
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Old September 30th, 2008, 07:52 AM   #9
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i see the 23 but what do they mean by a 8 tooth drive gear?
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