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Is There A Way To Find Out If You Have 3:73's?

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Old 09-15-2004, 11:38 PM
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LOVEMY88GT
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Default Is There A Way To Find Out If You Have 3:73's?

Well i have a 88 GT and its a manual five speed and it has the short throw shifter but the last owner said it had 3:73's but how do you really know? Certain Rpm's at 60mph? Tag somewhere? Well if anyone knows hey dont be affraid to write.

Thanks!!!

~Nick
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Old 09-15-2004, 11:41 PM
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mdvaldosta
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Default RE: Is There A Way To Find Out If You Have 3:73's?

Yea get in fifth gear at 60 mph and what your rpm's are. 2k rpms in 5th at 60mph would be 3.73's
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Old 09-15-2004, 11:49 PM
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Default RE: Is There A Way To Find Out If You Have 3:73's?

So many websites with the specs saying that the 1988 Mustang GT 5.0L 5 speed Manual has a 3:73 with posi differencial. WTF???
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Old 09-16-2004, 12:26 AM
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Grimace5.0
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Default RE: Is There A Way To Find Out If You Have 3:73's?

this thread might help
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Old 09-16-2004, 09:57 AM
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Default RE: Is There A Way To Find Out If You Have 3:73's?

hmm well when i get home today i will try that method. So if i dont have 3:73's what is a general price for them and how much of a bitch are they to do?
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Old 09-16-2004, 01:17 PM
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87mustang347
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Default RE: Is There A Way To Find Out If You Have 3:73's?

lol if ur not a machanic id say dont even attempt to do them urself, it dont matter how good u think u are. take it to a pro or a speed shop and have them put it in. labor on it will all depend on how long it takes cause who ever u bring it to mite get the backlash and all the specs rite the first time but usually it doesnt happen. the guy thats goon do mine said at the most 500 for laber but if it just takes him a couple of hours then it shood only b a couple hundred bucks
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Old 09-16-2004, 01:22 PM
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Default RE: Is There A Way To Find Out If You Have 3:73's?

hmm well i got other things that are going on right now other then trying to find out what gears. I have to pull my tranny now so the shop can take a look at it. Ahh the pride of owning a older car.
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Old 09-16-2004, 03:07 PM
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Default RE: Is There A Way To Find Out If You Have 3:73's?

ORIGINAL: Grimace5.0

this thread might help
Damn glad to see someone knows how to go back and read the older posts! LOL
saves me from having to go back and copy and paste the same thing over and over again.
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Old 09-16-2004, 04:53 PM
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Default RE: Is There A Way To Find Out If You Have 3:73's?

I'm a little confused on the whole RPM vs. MPH way of finding out your gear ratio. Since 3.73's are not stock, seems that you'd need the correct offset speedometer gear installed for this to be true. The speedometer measures MPH at the tranny, before it ever reaches the rear end. So if you change the rear gears you'll still have the same RPM/MPH relation, just that your ACTUAL speed will be incorrect unless you change the speedo gear. If the speed gear has been changed, then you could just look at it and find out which gear set it's designed to offset. But that's still it's no guarentee.
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Old 09-16-2004, 05:43 PM
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roundman
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Default RE: Is There A Way To Find Out If You Have 3:73's?

ORIGINAL: gwargantua

I'm a little confused on the whole RPM vs. MPH way of finding out your gear ratio. Since 3.73's are not stock, seems that you'd need the correct offset speedometer gear installed for this to be true. The speedometer measures MPH at the tranny, before it ever reaches the rear end. So if you change the rear gears you'll still have the same RPM/MPH relation, just that your ACTUAL speed will be incorrect unless you change the speedo gear. If the speed gear has been changed, then you could just look at it and find out which gear set it's designed to offset. But that's still it's no guarentee.
When in doubt, just pull the rear end cover and count the teeth on the ring and pinion and do the math!
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