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  • SN95 4.6L Mustang Tech

How do you tell gear ratio?

  • Thread starter Thread starter Kevin2811
  • Start date Start date May 27, 2004
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Kevin2811

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May 10, 2004
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How can you tell what ratio a gear is?
 

WLD_WST

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#2
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my 98 had a tag on the rear telling it had a 2.73
 

WhiteDevil69

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#3
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Kevin2811 said:
How can you tell what ratio a gear is?
Click to expand...
count the teeth!
 
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Kevin2811

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My buddy has a set of unused 8.8 gears but he can't remember if they are 3.73's or 4.10.
 
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HIGDON

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It's stamped on the pinion head and on the side of the ring gear.
 
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00GTblkvert

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I believe it like this -- raise the rear of your car, rotate the rear tire one revolution - watch the driveshaft as it turns. If it turns a little over 3 times you probably have 3.23's -- turns 4 times you could have 4.10's and so on. Hope this helps.
 
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Kevin2811

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Thanks for the help. The gears are unused and not installed. The ring has 41 teeth and the pinion has 10. I think that equals 4.10. Anyone know?
 

twogts4us

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#8
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Kevin2811 said:
Thanks for the help. The gears are unused and not installed. The ring has 41 teeth and the pinion has 10. I think that equals 4.10. Anyone know?
Click to expand...

That would be 1:4.1 - you are correct!!!
 
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Kevin2811

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Thanks for the help as always!
 
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Arnolds97

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My 97 Automatic has a tag that reads 3L08 which i am assuming means 3.08's.
 

stangman

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00GTblkvert said:
I believe it like this -- raise the rear of your car, rotate the rear tire one revolution - watch the driveshaft as it turns. If it turns a little over 3 times you probably have 3.23's -- turns 4 times you could have 4.10's and so on. Hope this helps.
Click to expand...


close but not quite pretty much reverse of what you just said. turn the axle one rotation, & if the tires make 4.10 rotations around, per one rotation of the driveshaft. you my friend would have 4.10 gears
 

KaPPaBaLL

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c2see21 said:
close but not quite pretty much reverse of what you just said. turn the axle one rotation, & if the tires make 4.10 rotations around, per one rotation of the driveshaft. you my friend would have 4.10 gears
Click to expand...

no, he's right you're wrong.
 
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HIGDON

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#13
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Yep, tire rotates once, driveshaft rotates multiple times(Ring is bigger than pinion therefore ring moves slower than pinion...)
 

kirkyg

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May 28, 2004
#14
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find out what mph you go in what gear at what rpm and you can ask on here and we can tell you.

kirkyg
 

KaPPaBaLL

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here's another one. put car in 4th gear.. drive at 70mph... read the tachometer. Whatever that says is your gear ratio. those are the only two ways i know of.
 

DJsZincGT

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c2see21 said:
close but not quite pretty much reverse of what you just said. turn the axle one rotation, & if the tires make 4.10 rotations around, per one rotation of the driveshaft. you my friend would have 4.10 gears
Click to expand...

Yeh man he was correct, the driveshaft would turn 4.10 times to the wheels turning once. Sorry man, just poking at ya a little.
 
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Kevin2811

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Thanks for all the help! 4.10's about to go in!
 
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CottonBurnerz

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#18
  • May 29, 2004
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ok I want want to get this opportunity and ask about the gear ratio thingy.. I surfed around sites and see lots of gears info then I cam across a chart like this..

1st gear - .345
2nd gear - 1.34
3rd gear - 2.11
4th gear - .433
5th gear - .923

final gear ratio - 2.340

what the hell do those mean? How do they related to the gear ratio the car has? (3.27, 4.10, etc..)
 

stangman

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#19
  • May 29, 2004
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DJsZincGT said:
Yeh man he was correct, the driveshaft would turn 4.10 times to the wheels turning once. Sorry man, just poking at ya a little.
Click to expand...


what was i thinking i don't even remember posting that
 

stangman

15 Year Member
Jul 10, 2003
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May 29, 2004
#20
  • May 29, 2004
  • #20
CottonBurnerz said:
ok I want want to get this opportunity and ask about the gear ratio thingy.. I surfed around sites and see lots of gears info then I cam across a chart like this..

1st gear - .345
2nd gear - 1.34
3rd gear - 2.11
4th gear - .433
5th gear - .923

final gear ratio - 2.340

what the hell do those mean? How do they related to the gear ratio the car has? (3.27, 4.10, etc..)
Click to expand...


i'm not exactly sure how they do the gear ratio through the tranny. the 4.10 is the final DRIVE ratio though, which, if im not mistaken is, completely different than the final gear ratio someone will call me on it if i'm wrong
 
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