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Old 04-30-2008, 10:07 PM   #1
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3.73 gears

Ok, I am considering putting in gears and a T-lock. I currently have a 2000 5-Speed. I was curious as to what each gear would red line at after the gears were in. Thanks.
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Old 04-30-2008, 10:47 PM   #2
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Re: 3.73 gears

Do you mean what speed you will redline at?
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Old 04-30-2008, 11:08 PM   #3
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Re: 3.73 gears

Yeah in each gear, what speed would I red line at? Like now 3rd at 90, 4th 115 due to speed governor.
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Old 05-01-2008, 08:35 AM   #4
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Re: 3.73 gears

2nd for me with 3.73s in my t-5 was 55mph~
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Old 05-01-2008, 11:38 AM   #5
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Re: 3.73 gears

Yea that sounds about right for second. Now I just need to know what they would be if I had 3.73 gears.
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Old 05-01-2008, 01:24 PM   #6
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Re: 3.73 gears

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Originally Posted by fasternu_674 View Post
Yea that sounds about right for second. Now I just need to know what they would be if I had 3.73 gears.
Brandon just answered that 55 MPH
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Old 05-01-2008, 02:17 PM   #7
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Re: 3.73 gears

I need to know about 1st, 3rd, 4th, 5th Thanks!
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Old 05-01-2008, 02:40 PM   #8
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Re: 3.73 gears

You can shift at any RPM that feels good up till the Red Line. Factory red line for mine was 5,500 ,my current red line is set at 6,000 RPM
Red Line to me means max RPM to shift at before the rev limiter shuts you down Not sure exctly what your lookin for
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Old 05-01-2008, 03:50 PM   #9
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Re: 3.73 gears

Ok let me try and explain this again. I want to know how much the 3.73 gears will change my overall speed in each gear. Meaning I want to know how fast you can go in each gear (with the 3.73's installed) if you were shifting at red line.

Ex. Stock Gear Ratio (not entirely sure on these just making up numbers)

1st 20mph
2nd 50mph
3rd 90mph
4th 115mph (due to speed limiter)
5th 115mph (due to speed limiter)

What I need is the numbers for 3.73 gears.
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Old 05-01-2008, 06:59 PM   #10
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Re: 3.73 gears

stock 2.73 gears puts out .366 ratio of the tires to drive shaft (1 turn of the tires gives 2.73 turns of the driveshaft)

3.73 comes out to a .268 ratio. So as you can see by the ratios the drive shaft is doing more turns of course. Going by that .098 is the difference between the two gear ratios in percentage that is 9.8 percent increase in drive shaft turns per full rotation of the tire.

So basically since off the engine is 1:1 its going to be 9.8% more rpms over where you are at now. Going by that your limit in each gear should lower about 9.8 percent gear to gear~
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Old 05-01-2008, 09:08 PM   #11
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Re: 3.73 gears

I don't need to figure out what my difference in rpm will be. I need to figure out what the change in mph will be. I know it can be figured out by rpm and using the circumference of the tire but I don't want to take the time to do that. There has to be another guy out there that has a V6 5-speed with 3.73 gears that knows how fast the car is going at red line in each gear.
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Old 05-02-2008, 11:07 AM   #12
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Re: 3.73 gears

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Originally Posted by SpectorV View Post
stock 2.73 gears puts out .366 ratio of the tires to drive shaft (1 turn of the tires gives 2.73 turns of the driveshaft)

3.73 comes out to a .268 ratio. So as you can see by the ratios the drive shaft is doing more turns of course. Going by that .098 is the difference between the two gear ratios in percentage that is 9.8 percent increase in drive shaft turns per full rotation of the tire.

So basically since off the engine is 1:1 its going to be 9.8% more rpms over where you are at now. Going by that your limit in each gear should lower about 9.8 percent gear to gear~
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Old 05-02-2008, 11:55 AM   #13
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Re: 3.73 gears

I know what you mean, but I don't know what speeds each gear redlines at.....I have 3.73's but I usually only go redline when im at the track and im not lookin at my speedo, im concentrating on the everything around me....i don't even know where to look this up either, sorry man
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Old 05-02-2008, 12:19 PM   #14
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Re: 3.73 gears

you have 3.27 stock you want 3.73 so the differance is 0.88

Multiply the 3.27 speed (MPH) by .88 and you have the 3.73 speed (MPH)
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Old 05-02-2008, 12:54 PM   #15
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Re: 3.73 gears

rpm = mph x gear ratio x 336 / tire diameter

issue is if your trans gear as stated below, I think yours might be different by a tad.

3.73 Gear Ratio:

1 - 2.95 Gear 5500 rpm - 39mph (42mph@6000)
2 - 1.94 Gear 5500 rpm - 59mph (65mph@6000)
3 - 1.34 Gear 5500 rpm - 86mph (93mph@6000)
4 - 1.00 Gear 5500 rpm - 115mph (125mph@6000)
5 - 0.63 Gear 5500 rpm - 185mph (199mph@6000)
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Old 05-02-2008, 01:16 PM   #16
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Re: 3.73 gears

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Originally Posted by Herbstang View Post
you have 3.27 stock you want 3.73 so the differance is 0.88

Multiply the 3.27 speed (MPH) by .88 and you have the 3.73 speed (MPH)
this will work also but its .886 to be a bit more accurate.
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Old 05-02-2008, 01:27 PM   #17
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Re: 3.73 gears

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this will work also but its .886 to be a bit more accurate.
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Old 05-04-2008, 08:21 PM   #18
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Re: 3.73 gears

Actually I found a calculator on the internet. It works nicely. It was created in excel specifically for the T-45 transmission. Just type in the gear ratio and tire diameter you want to run and it tells you your speed at different rpms. There is also a section where you can type in the gear and speed and it will tell you your rpm. It is pretty nice. Here is the link.

www.omslaw.net/tech/gearcalc.xls
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Old 05-04-2008, 09:29 PM   #19
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Re: 3.73 gears

you dont have a t-45 as you have a T-5 plus different T-5s are geared differently so figure out the gears in your exactly~
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Old 05-04-2008, 10:05 PM   #20
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Re: 3.73 gears

You can change the gear ratios for each gear. It tells you not to but you can do it. Still works really well.
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Old 05-11-2008, 05:35 PM   #21
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Re: 3.73 gears

I'm just now investigating this option, what I gathered so far is that a 3.73 gear ratio allows for higher speed in each gear, is that correct? I was under the impression that a higher gear ratio coming from the differential to the wheels would be more torquer off the line but allow for lower speed in each gear, what's the deal?

Oh, and what is the 0-60 on the 3.73 in comparison to the stock ratio? (6.6 I believe for stock)
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