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Old 10-13-2004, 02:16 PM   #1
kn7671
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6-speed gear ratio's - anyone know them

Anyone know what the gear ratio is for each gear of the 6-speed manual, M6 trans?

I thought is was the close ratio Tremec T56, but if that were the case, we would be able to go the speeds below according to my calculations @6200rpm for 1st, 2nd, 3rd:

1st = 51mph
2nd = 77mph
3rd = 105mph
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Old 10-13-2004, 02:27 PM   #2
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Quote:
Originally Posted by kn7671...
Anyone know what the gear ratio is for each gear of the 6-speed manual, M6 trans?

I thought is was the close ratio Tremec T56, but if that were the case, we would be able to go the speeds below according to my calculations @6200rpm for 1st, 2nd, 3rd:

1st = 51mph
2nd = 77mph
3rd = 105mph

Yep:

1st 2.97:1 @6000rpm = 44 mph
2nd 2.07:1 @6000rpm = 63 mph
3rd 1.43:1 @6000rpm = 91 mph
4th 1.00:1 @6000rpm = 131 mph
5th 0.84:1 @6000rpm = 155 (speed limited)
6th 0.57:1 @6000rpm = 155 (speed limited)

Courtesy of Road and Track Magazine

EDIT: Oh yeah....rear diff is 3.46:1, so just multiply that by the ratio of whatever gear you're in to get overall ratio.

Last edited by HRJ; 10-13-2004 at 02:34 PM.
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Old 10-13-2004, 04:15 PM   #3
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Not that I would shift at redline, but isn't the GTO's 5.7L LS1 engines redline 6200rpm?

Or is 6000rpm the redline, and 6200rpm the fuel cut-off?
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Old 10-13-2004, 04:28 PM   #4
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I read those somewhere else on here. With those ratios, it's *almost* the equivalent gearing of my old '99 SS with the M6 and 4.10s.
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Old 10-13-2004, 04:54 PM   #5
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So which one do you want the MN6 or the M12? The GTO uses the M12 which is the ratios that are posted, the MN6 uses different first second and third gears, which do you want?
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Old 10-13-2004, 05:08 PM   #6
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Quote:
Originally Posted by GTPprix...
So which one do you want the MN6 or the M12? The GTO uses the M12 which is the ratios that are posted, the MN6 uses different first second and third gears, which do you want?

Are you sure? According to the build sheets of the '04 M6's on our lot, they are built w/MN6. Where did you get this information?
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Old 10-13-2004, 05:09 PM   #7
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Quote:
Originally Posted by kn7671...
Not that I would shift at redline, but isn't the GTO's 5.7L LS1 engines redline 6200rpm?

Or is 6000rpm the redline, and 6200rpm the fuel cut-off?

I just copied the specification chart from R&T's road test of the GTO. I don't know why they used 6000rpm.
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Old 10-13-2004, 07:10 PM   #8
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Quote:
Originally Posted by HRJ...
Are you sure? According to the build sheets of the '04 M6's on our lot, they are built w/MN6. Where did you get this information?

open the hood of a car and you will see M12!
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Old 10-13-2004, 08:29 PM   #9
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MN6 was an RPO. Perhaps they did away with that combo as the RPO and replaced it with M12. Nothing more, nothing less.
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Old 10-13-2004, 08:30 PM   #10
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ANd the rev limiter is 6,250 rpm. But since our tachs may be a tad slow, it may show 6,000 when it hits.
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Old 10-14-2004, 04:56 AM   #11
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You're right. I'll see if i can post the build sheet.
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Old 10-14-2004, 05:06 AM   #12
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Here is a build sheet from one of our lot vehicles:

***Vehicle Build***



Home - Summary - Claim History - Vehicle Build - Vehicle Component - Delivery Information - Dealer Information - Service Contract - Warranty Block - Branded Title


VIN 6G2VX12G34L297536
VEHICLE BUILD
Merchandising Model : 2VX37 -2004 GTO COUPE
Gross Vehicle Weight Rating : N/A Order Number : HFQQST
Build Date : 08/13/2004 Build Plant : 64LV
OPTION CODES
AH5 - FRT PWR DRIVER SEAT,8-WAY
AH8 - FRT PASS POWER SEAT,8-WAY
AK3 - FRT SEAT HEAD RESTRAINT
AK5 - DUAL FRONTAL AIR BAGS
AQ9 - CUSTOM BUCKET STS
A88 - SEAT HEADREST
B58 - FLOOR MATS
C60 - AIR CONDITIONING, CUSTOM
C95 - LAMP, ROOF COURTESY & READING
DL5 - DECAL ROADSIDE SERVICE
DL6 - MIRROR O/S REMOTE CONTROL,ELEC
EF7 - UNITED STATES OF AMERICA
FE2 - SUSPENSION SYSTEM, HANDLING
FE9 - 50 STATE EMISSIONS
GH4 - EQUIPMENT ADD'L USA
GS9 - AXLE REAR 3.46 RATIO
G80 - LIMITED SLIP TORSEN REAR DIFFERENTIAL
JL9 - ANTILOCK BRAKES - FRT & RR DISC
K30 - CRUISE CONTROL AUTOMATIC
LHD - VEHICLE DRIVE LEFTHAND
LS1 - ENGINE,8CYL 5.7L SFI
MN6 - TRANSMISSION, 6-SPEED MANUAL
M12 - TRANSMISSION, MAN 6 SPD
NP5 - LTHR WRAP STEERING W/RAD CNTRLS
NT9 - FED EMIS SYS, TIER 2 PHASE-OUT
N40 - POWER STEERING
PZ9 - WHEEL, 17 X 8, ALUMINUM
QWZ - P245/45ZR17 W-RATED TIRES
R6J - CUSTOMER DIALOG NETWORK
R9U - GM ACCESS - AUTOBOOK IDENTIFIER
SLM - SALES STOCK ORDERS
T43 - SPOILER, REAR DECK LID
T82 - HEADLAMPS AUTO ON-OFF
U1X - RADIO, AM/FM STEREO, SEEK/SCAN MULTI CD,CLOCK,ETR HPS
U77 - REAR WINDOW ANTENNA
VM5 - LABEL INFOR BMP IMP STD FRT/RR
V5Z - PLATE SAFETY COMPLIANCE-DELETE
V73 - VEHICLE CERTIFICATION U.S.
W62 - EQUIPMENT GTO PERFORMANCE PKG
1SZ - OPTION PACKAGE DISCOUNT
24U - IMPULSE BLUE METALLIC
81I - INTERIOR TRIM ANTHRACITE
812 - ANTHRACITE,LEATHER TRIM COMB


1998-2004 General Motors Corporation. All Rights Reserved.


The only thing that shows up on the stock reports is MN6. Since I currently own an A4, this is not what I see when I pop the hood. So I guess this actually both an MN6 and an M12 based on this build sheet, and it's the same tranny, so the gear ratios won't be different. Right? So I still don't understand why there are two tranny codes assigned to one car. Anyone?
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Old 10-14-2004, 05:07 AM   #13
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And I believe my tag does say MN6 under the hood.

So either one can be used interchangibly.

No reason to fret guys.
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Old 10-14-2004, 05:11 AM   #14
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Thats actually not true, the MN6 has different first second and third and is still the RPO in the base C6 six speed, the M12 is the uplevel C6 Z51 trans also found in the GTO. They are still seperate entities for now. M12 is considered an upgrade over the MN6 so the MN6 gets keyed into build first and then replaced by M12 which is why they both show up.

Last edited by GTPprix; 10-14-2004 at 05:21 AM.
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Old 10-14-2004, 05:44 AM   #15
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Quote:
Originally Posted by GTPprix...
Thats actually not true, the MN6 has different first second and third and is still the RPO in the base C6 six speed, the M12 is the uplevel C6 Z51 trans also found in the GTO. They are still seperate entities for now. M12 is considered an upgrade over the MN6 so the MN6 gets keyed into build first and then replaced by M12 which is why they both show up.

I still want to know where you are getting this info from....
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Old 10-14-2004, 06:00 AM   #16
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I just called GM. They say that the actual trans is an M12. MN6 is the merchandising code for the same transmission. So they are one and the same. He also warned me not to mix it up with MM6, because according to him many people do, so I thought I'd pass that along too.
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Old 10-14-2004, 06:32 AM   #17
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Quote:
Originally Posted by HRJ...
I still want to know where you are getting this info from....

A little birdie

Last edited by GTPprix; 10-14-2004 at 06:36 AM.
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Old 10-14-2004, 07:14 AM   #18
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Double checked in the GM Service Manual and it definetly is an M12...
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Old 10-14-2004, 03:35 PM   #19
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Quote:
Originally Posted by CMNTMXR57...
ANd the rev limiter is 6,250 rpm. But since our tachs may be a tad slow, it may show 6,000 when it hits.

According to what LS1 Edit hacked out of my computer, my rev limit was factory set at 6200 rpm.
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Old 10-14-2004, 09:20 PM   #20
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GM Service Information
Document ID# 1338233
2004 Pontiac GTO
Manual Transmission Description and Operation
Manual transmissions are identified by the number of forward gears and the measured distance between the centerline of the output shaft and the counter gear.

The 6-speed manual transmission (RPO M12), incorporates the following features:

An aluminum case
Fully synchronized gearing with an enhanced synchronizer cone arrangement:
Triple-cone: FIRST, SECOND
Double-cone: THIRD, FOURTH, FIFTH, SIXTH
Single-cone: REVERSE
An internal shift rail mechanism
A remote transmission shift control mounted forward of the transmission
An external transmission shift rod enabling the forward mount location of the transmission shift control
An extended-length transmission output shaft mating directly to the rear axle drive pinion, in the rear of the differential housing
Tapered roller bearings supporting the mainshaft and countershaft
Caged roller bearings under all speed gears
Solenoid inhibit of SECOND and THIRD gears
Solenoid inhibit of REVERSE gear during predefined forward motion
These features combine to yield a rugged, reliable system capable of handling input torques of up to 610 Nm (450 lb ft) for the M12.

The gear ratios are as follows:

Gear M12 Ratio (:1)

FIRST 2.97
SECOND 2.07
THIRD 1.43
FOURTH 1.00
FIFTH 0.84
SIXTH 0.57
REVERSE 3.28
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Old 10-14-2004, 09:34 PM   #21
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one more ....
Document ID# 1140218

--------------------------------------------------------------------------------
Manual Transmission Description and Operation

Manual transmissions are identified by the number of forward gears and the measured distance between the centerline of the output shaft and the counter gear.

The 6-speed manual transmission (RPO MM6/M12) incorporates the following features:

An aluminum case
Fully synchronized gearing with an enhanced synchronizer cone arrangement:
Triple-cone: FIRST, SECOND
Double-cone: THIRD, FOURTH, FIFTH, SIXTH
Single-cone: REVERSE
An internal shift rail mechanism
A remote transmission shift control mounted forward of the transmission
An external transmission shift rod enabling the forward mount location of the transmission shift control
An extended-length transmission output shaft mating directly to the rear axle drive pinion, in the rear of the differential housing
Tapered roller bearings supporting the mainshaft and countershaft
Caged roller bearings under all speed gears
Solenoid inhibit of SECOND and THIRD gears
Solenoid inhibit of REVERSE gear during predefined forward motion
These features combine to yield a rugged, reliable system capable of handling input torques of up to 610 Nm (450 lb ft) for the MM6 and 540 Nm (400 lb ft) for the M12.

The gear ratios are as follows:

Gear MM6 Ratio (:1) M12 Ratio (:1)
FIRST 2.66 ---------- 2.97
SECOND 1.78 ---------- 2.07
THIRD 1.30 ---------- 1.43
FOURTH 1.00 ---------- 1.00
FIFTH 0.74 ---------- 0.84
SIXTH 0.50 ---------- 0.57
REVERSE 2.90 ---------- 3.28
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Old 10-15-2004, 05:10 AM   #22
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So I guess this basically means that my first post was correct and answered the guys question correctly.
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Old 10-15-2004, 06:17 AM   #23
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Quote:
Originally Posted by Baaa...
According to what LS1 Edit hacked out of my computer, my rev limit was factory set at 6200 rpm.

What's the difference. And BTW, it's HP Tuners, not LS1 Edit.
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Old 10-15-2004, 08:07 AM   #24
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BTW, here is a link to a nice Road & Track one page spec sheet for the '04 GTO:

http://www.roadandtrack.com/assets/d...3200311617.pdf

(If you are using I.E., right click the link and "Save Target As.." to make a local copy)
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Old 10-15-2004, 02:39 PM   #25
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Quote:
Originally Posted by HRJ...
I still want to know where you are getting this info from....

Thats Chris White i know him from the GP community.. He has his sources
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Old 10-15-2004, 02:56 PM   #26
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Says M12 under my hood.
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Old 10-15-2004, 04:48 PM   #27
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Quote:
Originally Posted by Robul...
Thats Chris White i know him from the GP community.. He has his sources

Hey whats goin on man!! Are you another convert?
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Old 10-15-2004, 05:44 PM   #28
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Quote:
Originally Posted by GTPprix...
Hey whats goin on man!! Are you another convert?

yup yup..

I took the pope out and everyone in texas claimed my fastest grand prix in texas title. Eventually chipped a piston made it stock and took the step to the GOAT. I am very pleased so far.
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Old 10-15-2004, 06:13 PM   #29
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Sweet!! I see you got the Retard welcome from IndigohomoZ24 on CGP
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Old 10-16-2004, 05:29 PM   #30
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www.shagfinger.com/ratios.htm
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