The Transmission Thread!
Senior Member
Joined: 09-21-06
Posts: 2,270
Likes: 1
From: Midwest
Keep in mind there are two different ratio sets on the F40's. Pre 2007 and 2007+.
Generally speaking, I've only seen Pre 2007's for sale.
We need part #'s! lol. (I need a break from workt to get them!)
Senior Member
Joined: 02-13-08
Posts: 1,126
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From: Davenport, IA
I remember watching the Speed Channel years ago, and the guy did offroad buggy, rock climbing.
He took the LSJ, and said he had to fit it with a special plate to get it to work with his auto tranny.
He took the LSJ, and said he had to fit it with a special plate to get it to work with his auto tranny.
Senior Member
Joined: 06-28-06
Posts: 6,651
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From: Rochester, mn
FOUND THIS, ON THE SAAB FORUMS THEY SAY THE MU9 IS A DIRRECT FIT WITH THE COBALT 'S F35
2008 F40 (MU9)
General Motors Powertrain-Europe F40 six-speed manual car transaxle
2008 Model Year Summary
Carryover Features and Benefits from 2007 model year
DETENT SYSTEM FOR QUICKER AND EASIER SHIFTING
The addition of a ball-and-spring-type detent on the shift sleeve and detents on the shift rail assists the driver in shifting quicker. The detent raises the force required to move the shift lever which prevents excess movement of the shifter by the driver, and reduces the chance of double bump. Tension between the shift sleeve and the shift rail also prevents the sleeve from vibrating while in gear.
GEAR RATIO CHANGES FOR QUICKER ACCELERATION
To adapt the F40 to North American applications and maximize performance, 3rd through 6th gears have been changed to higher-ratio gears starting in 2007 model year. The ratio for 3rd gear is now 1.37:1, and the ratio for 4th gear is no longer an overdrive, with a new ratio of 1.05:1. The 5th gear ratio is 0.85:1 and the 6th gear ratio is 0.71:1.
LOW MAINTENANCE
The MT2/MU9 uses a Castrol Burmah (BOT 0063) manual transmission fluid, and is validated as "fill-for-life". No maintenance is required for normal operation.
OVERVIEW
Originally a design developed for Fiat, Opel and Saab applications, the F40 (MT2) is a GM Powertrain - Europe six-speed manual transaxle built in Russelsheim, Germany. Its first use in a North American application was the Pontiac G6 for the 2006 model year. It is also used in some Saab 9-3 and 9-5 models.
It is a three-axis design, with first, second, fifth, and sixth gears on an output shaft behind and below the input shaft, and third and fourth gears are on an output shaft in front of and above the input shaft. Both output shaft pinions drive a helical gear with a conventional differential. The clutch is mounted on a dual-mass flywheel to dampen vibrations on whichever output shaft is idle depending upon which gear is selected.
The F40 is cast in aluminum, and weighs 124 pounds (see specs). It has been certified for up to 400 Nm of engine torque.
Triple-cone synchronizers are used on 1st and 2nd gears. These synchronizers have three friction surfaces, which increase their ability to transfer the flow of torque more smoothly from one gear to another. Synchronizers act as clutches to speed up or slow down the gearsets that are being shifted to, and greater friction area results in easier shifting for the driver. The 3rd, 4th, and reverse synchronizers are double-cone, while the 5th and 6th gear synchronizers are single-cone. All of the friction surfaces on the synchronizer rings are sintered bronze. The ratios in the 6-speed are widely spaced for versatile performance and efficiency.
2008 F40 (MU9)
General Motors Powertrain-Europe F40 six-speed manual car transaxle
2008 Model Year Summary
Carryover Features and Benefits from 2007 model year
DETENT SYSTEM FOR QUICKER AND EASIER SHIFTING
The addition of a ball-and-spring-type detent on the shift sleeve and detents on the shift rail assists the driver in shifting quicker. The detent raises the force required to move the shift lever which prevents excess movement of the shifter by the driver, and reduces the chance of double bump. Tension between the shift sleeve and the shift rail also prevents the sleeve from vibrating while in gear.
GEAR RATIO CHANGES FOR QUICKER ACCELERATION
To adapt the F40 to North American applications and maximize performance, 3rd through 6th gears have been changed to higher-ratio gears starting in 2007 model year. The ratio for 3rd gear is now 1.37:1, and the ratio for 4th gear is no longer an overdrive, with a new ratio of 1.05:1. The 5th gear ratio is 0.85:1 and the 6th gear ratio is 0.71:1.
LOW MAINTENANCE
The MT2/MU9 uses a Castrol Burmah (BOT 0063) manual transmission fluid, and is validated as "fill-for-life". No maintenance is required for normal operation.
OVERVIEW
Originally a design developed for Fiat, Opel and Saab applications, the F40 (MT2) is a GM Powertrain - Europe six-speed manual transaxle built in Russelsheim, Germany. Its first use in a North American application was the Pontiac G6 for the 2006 model year. It is also used in some Saab 9-3 and 9-5 models.
It is a three-axis design, with first, second, fifth, and sixth gears on an output shaft behind and below the input shaft, and third and fourth gears are on an output shaft in front of and above the input shaft. Both output shaft pinions drive a helical gear with a conventional differential. The clutch is mounted on a dual-mass flywheel to dampen vibrations on whichever output shaft is idle depending upon which gear is selected.
The F40 is cast in aluminum, and weighs 124 pounds (see specs). It has been certified for up to 400 Nm of engine torque.
Triple-cone synchronizers are used on 1st and 2nd gears. These synchronizers have three friction surfaces, which increase their ability to transfer the flow of torque more smoothly from one gear to another. Synchronizers act as clutches to speed up or slow down the gearsets that are being shifted to, and greater friction area results in easier shifting for the driver. The 3rd, 4th, and reverse synchronizers are double-cone, while the 5th and 6th gear synchronizers are single-cone. All of the friction surfaces on the synchronizer rings are sintered bronze. The ratios in the 6-speed are widely spaced for versatile performance and efficiency.
dur, has this been confirmed??
New Member
Joined: 11-22-10
Posts: 1
Likes: 0
From: malta
hello i m from malta and i have a problem with my f23 box.tha forks have plastic tips and they always fall and the gear won`t enter.i heard that there are forks in usa that the tips are made of brass.can someone help me please to find these forks
source? and im slightly confused, as cobalts push much more than 325tq at the output shaft into the differential, so 325 at the input shaft sounds much more logical.
Here HK: Automatic Transmission GM 4T40E and 4T45E FWD Rebuild Kits, Supply the parts and save money! - Drivetrain.com
They wouldn't have detuned the HHR SS if the 4t45e was designed to handle 325ftlbs from the input shaft.
The 4t60e for comparison: 4L60E Automatic Transmission Common Failures Modes, Trouble Shooting Codes & Rebuild Kits - Drivetrain.com
350ftlbs from the engine and a whopping 670ftlbs after torque conversion.
They wouldn't have detuned the HHR SS if the 4t45e was designed to handle 325ftlbs from the input shaft.
The 4t60e for comparison: 4L60E Automatic Transmission Common Failures Modes, Trouble Shooting Codes & Rebuild Kits - Drivetrain.com
350ftlbs from the engine and a whopping 670ftlbs after torque conversion.
New Member
Joined: 09-29-21
Posts: 1
Likes: 0
From: new brunswick
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