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Is There a Way to Find What Gears You Have?

  • Thread starter Thread starter ReefBlueHatch
  • Start date Start date Jan 19, 2010
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ReefBlueHatch

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Jan 12, 2010
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Jan 19, 2010
#1
  • Jan 19, 2010
  • #1
My car had the mods done two owners ago, so I wanted to know if there's a way to find what gearing a car has. Maybe something with what RPM's at what MPH? Any help would be appreciated.
 

Repostyle

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Jan 19, 2010
#2
  • Jan 19, 2010
  • #2
Easiest way is to jack up the car, rotate the wheel one full rotation and count how many times the drive shaft goes around, 2.73's will go around 2(2) and almost 3/4(.73) turns with one rotation and so on. Just put a mark on the DS and start countin'.
 

old_blue

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Nov 3, 2003
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Jan 22, 2010
#3
  • Jan 22, 2010
  • #3
if it is factory then there should be a metal "dog" tag on one of the rear end housing bolts toward the top
 

tannerc91gt

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Jan 22, 2010
#4
  • Jan 22, 2010
  • #4
what repostyle said is the best method. Just mark the driveshaft with a grease pen and count the rotations.
 

ReefBlueHatch

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Jan 22, 2010
#5
  • Jan 22, 2010
  • #5
Thanks, guys. I'll have to do this when I work on my crappy drums.
 

TRWXXA

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Jan 18, 2003
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RIGHT BEHIND YOU!!!... Made you look.
Jan 22, 2010
#6
  • Jan 22, 2010
  • #6
Do it sort of like Repostyle said, but I suggest rotating the wheel 10 times and counting the turns of the driveshaft. Mark them both with a piece of tape and have someone turn the wheel for you while you watch the driveshaft. Divide your result by 10.

I have found from experience that it is hard to differentiate 3.1 turns (3.08s)from 3.3 turns (3.27s), or 3.6 turns from 3.7. It's much easier to tell 31 from 33, or 35 1/2 from 3 3/4.
 

Repostyle

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Jan 23, 2010
#7
  • Jan 23, 2010
  • #7
TRWXXA said:
Do it sort of like Repostyle said, but I suggest rotating the wheel 10 times and counting the turns of the driveshaft. Mark them both with a piece of tape and have someone turn the wheel for you while you watch the driveshaft. Divide your result by 10.

I have found from experience that it is hard to differentiate 3.1 turns (3.08s)from 3.3 turns (3.27s), or 3.6 turns from 3.7. It's much easier to tell 31 from 33, or 35 1/2 from 3 3/4.
Click to expand...

That does make more sense.

I installed my own gears so the simplest way for me was to just read the stamp on the ring gear itself
 

old_blue

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Jan 23, 2010
#8
  • Jan 23, 2010
  • #8
tannerc91gt said:
what repostyle said is the best method. Just mark the driveshaft with a grease pen and count the rotations.
Click to expand...

I thought mine was the best and easiest....
 

Tanus

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#9
  • Jan 23, 2010
  • #9
just 1 rotation is fine, lets say you think you might have 3.90s or 4.10s, just 1 tire rotation and it'll be obvious which it is.
 

Tanus

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  • Jan 23, 2010
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old_blue said:
I thought mine was the best and easiest....
Click to expand...
yeah, counting to 41 is way easier than counting to 4.1
 

ReefBlueHatch

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Jan 23, 2010
#11
  • Jan 23, 2010
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I have a feeling it has some pretty nice gears in it because it feels strong for a stock motor. What are good gears for a 5 speed?
 

Repostyle

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Jan 23, 2010
#12
  • Jan 23, 2010
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old_blue said:
I thought mine was the best and easiest....
Click to expand...

If it's stock it's 273's but his car was modded by a previous owner and the tag may be gone or inacurate now. When there's more than a CAI on a car you can't just go by factory specs anymore because you don't know if you got the complete mod list passed on down the line.

ReefBlueHatch said:
I have a feeling it has some pretty nice gears in it because it feels strong for a stock motor. What are good gears for a 5 speed?
Click to expand...

Most common for a street/strip car with a t5 are 327's and 355's
 

Tanus

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#13
  • Jan 23, 2010
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ReefBlueHatch said:
I have a feeling it has some pretty nice gears in it because it feels strong for a stock motor. What are good gears for a 5 speed?
Click to expand...
4.10s, perfect unless you like cruising around at 120mph, mine will go 75 at a low rpm, like 2,000-2,500rpm
 

ReefBlueHatch

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Jan 12, 2010
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Jan 23, 2010
#14
  • Jan 23, 2010
  • #14
The last owner was cloudy about mods; scary, eh? At 55, it will sit at 1500, 60 is about 1700. However, the speedo seems to be reading slower because when I drive along with my girlfriend, she's always going faster we're supposed to go 60. So maybe it hasn't been recalibrated.

Or maybe I just need get off my butt and head out to the garage!
 

old_blue

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#15
  • Jan 23, 2010
  • #15
Tanus said:
yeah, counting to 41 is way easier than counting to 4.1
Click to expand...

Yeah because I said count to 41..... hmmm let me look at the posts above........ nope dont see where I said count to 41.... oh ..... wait...... nope still not there.........hmmmmmmm...... I dont see where I said count to anything...... oh well.

Repostyle said:
If it's stock it's 273's but his car was modded by a previous owner and the tag may be gone or inacurate now. When there's more than a CAI on a car you can't just go by factory specs anymore because you don't know if you got the complete mod list passed on down the line.
Click to expand...

Yeah ya got me on this one. I forgot he said it had mods. My bad..... If they are 3.55's and you speedo is still off I may have an extra speedo/tranny gear hanging around. Or just check ebay. there are fairly cheap
 

Tanus

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  • Jan 24, 2010
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old_blue said:
Yeah because I said count to 41..... hmmm let me look at the posts above........ nope dont see where I said count to 41.... oh ..... wait...... nope still not there.........hmmmmmmm...... I dont see where I said count to anything...... oh well.
Click to expand...
you said "count 10 revolutions of the tire", I said "lets say", hypothetically, "you have a 4.10 gear" So a 4.10 gear would spin the driveshaft 41 times for every ten revolutions of the tire.

get it? read it ten times and then maybe you'll understand.
 

tannerc91gt

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#17
  • Jan 24, 2010
  • #17
Trwxxa said that actually....
 

nisreo

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#18
  • Jan 24, 2010
  • #18
tannerc91gt said:
Trwxxa said that actually....
Click to expand...
 

Tanus

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  • Jan 24, 2010
  • #19
hahha whoops, i post insults before reading, sorry old blue, I got confused, haha
 

old_blue

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#20
  • Jan 24, 2010
  • #20
no worries. My answer was no help either as I said "read the tag" on a "modded car".
 
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