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1994-1995 5.0 Mustang SN95 Tech Forum

5.0L Talk | 5.0L Tech | 94-95 Tech | 1979-1993   1994   1995   Upload Pictures | Timeslips | Power Adders | Mustang Tech 


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Unread 01-06-2010   #1 (permalink)
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Default How to find out what gears I have?

I have a 95 Mustang GT Convertible 5spd that i got off a buddy who doesn't know much about cars. Long story short, the 1st owner did some mods to it, which are unknown at this point. The only thing i would like to know is if there is any way to find out what gear i have in the rear? And if i have to open it up to find out, are there numbers or something to look for? Any help is appreciated. Thanks!
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Unread 01-06-2010   #2 (permalink)
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You can put the rear on jack stands, put a dot on the drive shaft and see how many times it spins with 1 full rotation of the wheel. If it spins a hair over 3, could be 3.08's or if it spins about 3 3/4's could be 3.73's or if it spins a alittle over 4, could be 4.10's in it. If you crack the rear cover, you just count the teeth on both and divided the ring by the pinion count.
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Unread 01-06-2010   #3 (permalink)
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The simplest and easiest way to find out what your gear ratio is to jack up the rear of the car, I recommend putting it on jackstands for safety reasons, get some white out and mark the driveshaft. Spin one of the wheels slowly one time by hand and count how many times the mark you made on the driveshaft goes around. 3.5 turns would be 3.55 gears, 3 3/4 times would be 3.73 gears, 4 times would be 4.10s, etc.

You could also pop the diff cover and look for markings on the gear, but then you have to deal with the nasty gear oil and re-sealing the cover. I'm not sure about all the different brands of gears, but the Ford racing gears are stamped with their gear ratio.

If you car doesn't have an aftermarket gear in it I would recommend putting one in it- the best seat of the pants improvement you can make for little money.

Good Luck
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Unread 01-06-2010   #4 (permalink)
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i knew i can count on you guys.. i thought i was gonna hafta get messy and open up the rear end.. thanks for savin me the hassle!
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Quote:
Originally Posted by NinJa_FLiP View Post
i knew i can count on you guys.. i thought i was gonna hafta get messy and open up the rear end.. thanks for savin me the hassle!
No prob

If you need any other help or suggestions shoot me a PM


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Unread 01-06-2010   #6 (permalink)
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There is another way, if your speedometer and tach are reasonably accurate.
Drive at 60mph and note the RPM@60mph in 4th gear (for a stick, 3rd for autos). Divide this noted rpm my 795. This will give you an approximation of your gear ratio.

In my example, I turn ~2950rpm@60mph in 4th gear. So 2950/795=3.71
3.71~=3.73. That's my gear ratio.

The 795 number comes from your tire diameter.
63360"=1 mile

63360/((tire diameter)(3.14159))=(the 795 number for 25.3" tire)
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Unread 01-06-2010   #7 (permalink)
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Quote:
Originally Posted by YLDPONY View Post
There is another way, if your speedometer and tach are reasonably accurate.
Drive at 60mph and note the RPM@60mph in 4th gear (for a stick, 3rd for autos).
Agree provided that the speedo's been corrected, otherwise that won't work if a r&p gear swap has been done without correcting the speedo. The driveshaft revolution method is much more reliable.
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Unread 01-06-2010   #8 (permalink)
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I will also add that with a limited slip rear end like we have, you need to turn the drive tire, or passenger side rear wheel to count the number of times the driveshaft rotates.

The only exact way to know for sure is to pull the rear diff. cover and count the teeth on the ring gear and divide that by the number of teeth on the pinion gear. This is the only true method for getting the EXACT gearing.










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Unread 01-06-2010   #9 (permalink)
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Quote:
Originally Posted by Bullitt95 View Post
Agree provided that the speedo's been corrected, otherwise that won't work if a r&p gear swap has been done without correcting the speedo. The driveshaft revolution method is much more reliable.
Or you could have someone run next to you at 60mph in a car with a known good speedometer and note the RPM then, that works too.
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Unread 01-06-2010   #10 (permalink)
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Quote:
Originally Posted by rj8806 View Post
I will also add that with a limited slip rear end like we have, you need to turn the drive tire, or passenger side rear wheel to count the number of times the driveshaft rotates.

The only exact way to know for sure is to pull the rear diff. cover and count the teeth on the ring gear and divide that by the number of teeth on the pinion gear. This is the only true method for getting the EXACT gearing.







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Very true. If you have to know with a doubt allowed, this is the way to go. 3.7272727272727272.... what?
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Unread 01-07-2010   #11 (permalink)
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looks to be 3.08's everyone.. darn!! i was hoping atleast 3.55's or 3.73's.. lol.. guess im not that lucky.. ha
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That sucks, but the good thing is when you slap gears in it the car will feel much faster than it currrently does. Hook it up on some 3.73s or 4.10s- you won't be disappointed.
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Unread 01-08-2010   #13 (permalink)
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yea i want gearing, but i havent completely decided on which ones just yet.. its a convertible, so i wanna cruise it, but i still want it to be quick.. ahhh.. the battle over the 3.55s vs 3.73s is still going on with me..
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Is it an auto or a 5-speed?

Most people put 3.73s in the 5-speed cars and 4.10s in the automatic cars.
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Unread 01-08-2010   #15 (permalink)
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yea ive read that too.. i have a 5speed.. but my goal is to be close to 300whp on the 302 and maybe eventually s/c it.. n ive read that you dont want too low of gearing for boost and that your hp can take you through the gears.. and blah blah blah.. so im still stuck in debate world.. lol
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