What do 3.73's Tac at?

SRT Handz · Oct 17, 2005

I wanna know what 3.73's tac at 80MPH. Right now with stock gears i am at around 2400 at 80 MPH in 5th. Is that right?

ocbaud · Oct 17, 2005

thats about what i have with my stock 3.27 gears, but i believe that the pre99's have a higher gear than that

goshia · Oct 17, 2005

That is about right...

thomas91169 · Oct 17, 2005

wtf 2400rpm at 80?

im still only doing 1800rpm in 5th at 80.

- edit -

went to taco bell, on way back checked the above statement.

at 80, i was at 2100rpm. at 85 i was 2350.

Joel's98GT · Oct 18, 2005

you should be about 2700rpm at 80 with 3.73

my 4.10'a rap about 2900-3000 at 80

wms004 · Oct 18, 2005

Joel's98GT said:
you should be about 2700rpm at 80 with 3.73

my 4.10'a rap about 2900-3000 at 80

That is correct.

I've got 3.73's and a dyno-tune for the speedo.

-Wade

'03GTinFLA · Oct 18, 2005

I checked mine this morning and I was at about 2500 at 80mph. But I was driving on the freeway trying to watch the speedo and RPM's without driving into anyone so it could be off a little.

SamMan · Oct 18, 2005

In my auto with 18's and DR's I am at ~2600 @ 75 / ~2800 @80.

hotmustang331 · Oct 18, 2005

Ill need t check it out, but mine does 2100 @ 70....about 2400 at 80. I have 3.73s and the TR-3650 with a .62 OD.

jasonh_86 · Oct 18, 2005

mine does around 2400-2500 at 80mph with my 3.73's.. TR-3650..

lover · Oct 19, 2005

Kind of hard to tell because there has been tranny swaps and gear swaps from Ford within a few years of each other. I think the 99-01 1/2 are different from the 02s, also the 04s.
I have an 02GT and my fiance has an 04GT. Our 1st and 5th gear ratios are different. That's just a 2 year difference. No telling how many changes were made the previous years.

Just use your onboard digital tachometer. It's a little more accurate than they needle one. But I think that feature is only on the 99-04

ocbaud · Oct 19, 2005

gt ratios:

1999:
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.67
R 3.22

2000:
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.67
R 3.22

2001(t45):
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.67
R 3.22

2001(3650):
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.67
R 3.22

2002:
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.67
R 3.22

2003:
axle- 3.27
1 3.37
2 1.99
3 1.33
4 1.00
5 0.62
R 3.22

2004:
axle- 3.55
1 3.35
2 1.99
3 1.33
4 1.00
5 0.62
R 3.22

http://www.mustangmeet.com/specs/2004.php

dont know how correct those are.

i've been using this calculator to see what the speeds should be. http://www.stangsource.com/calculators.cgi?calculator=1

using that, stock everything for my '01 i shoudl be running about 2400rpms @ 84mph

it would be 2600rpms @ 80mph with 3.73 gears

ocbaud · Oct 19, 2005

http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

another good resource

Joel's98GT · Oct 19, 2005

not very correct, the 8.8 is a 3.27

i'm alos not sure about the 3.55 in 04 it's been rumored but i haven't talked to anyone who has them.

the first 4 gears in the t-45 and t-3650 are the same from (96-05) 3.37, 1.99, 1.33, 1.00

but in overdrive the t-45 is .68 and the t-3650 used in the mustang is .62

info directly from tremec: http://www.ttcautomotive.com/English/products/tremec.asp

ocbaud · Oct 19, 2005

as far as i know, my gears are stock(the cover is caked with dirt and doesnt look like its ever been opened up.

My speedo reads at 80mph when my tach is at 2400 rpms.
if we have a .62 5th gear, than it shoudl be reading at 90mph @ 2400 rpm's with stock gears.

if i had 3.73's and a .62 5th gear, it would read exactly 2400 @ 80mph.

ocbaud · Oct 19, 2005

ok, from what i've read is that ford changed the 5th gear to .62 in 2003 to keep with epa standards.

lover · Oct 19, 2005

I thought they changed the 5th gear for better fuel economy. I didn't think the gears were the same for the T45 & 3650. The gearing was changed somewhere after the 01 1/2. But the hell if I know, I read it somewhere.

jasonh_86 · Oct 19, 2005

Just buy some 4.10's and call it a day.. that way you know what you got

What do 3.73's Tac at?

SRT Handz

I tripped & fell down and cut myself & got blood

ocbaud

Member

goshia

New Member

thomas91169

I'd donkey punch my sister.

Joel's98GT

New Member

wms004

'03GTinFLA

Member

SamMan

New Member

hotmustang331

Active Member

jasonh_86

I

lover

ocbaud

Member

ocbaud

Member

Joel's98GT

New Member

ocbaud

Member

ocbaud

Member

lover

jasonh_86

I

Similar threads

What do 3.73's Tac at?

I tripped & fell down and cut myself & got blood

Member

New Member

I'd donkey punch my sister.

New Member

Member

New Member

Active Member

I

Member

Member

New Member

Member

Member

I

Similar threads

Privacy & Transparency

Privacy & Transparency