1. 4t65e Transmission Rebuild Kit
2. 4t65e Transmission Pressure Test Ports
3. 4t65e Transmission Interchange Chart
4. 4t65e Transmission Forum
5. 4t65e Transmission Pan

This page provides information about the GM THM-4T65E 4 speed Automatic fwd transmission/transaxle which is found in many 1997 and newer vehicles equipped with the 3800 engine and most 2000 and newer vehicles with the 3400 engine. This is a great trans and has been refined a bit over recent years and as many of you know has its shortcomings, especially when the mileage gets high or extra power is added.

If you have a question about something that you do not see on this page feel free to contact us.

1. Oregon Performance Transmission is proud to offer this master rebuild kit for the GM 4T65E automatic transmission. Year range: 1997-2011. Transmission make: Buick, Chevrolet, GM, Oldsmobile, Pontiac, Saturn, Volvo. Transmission model: 4T65E, 4T65-E, 4T65E-HD, M15, MN3, MN7. This master rebuild overhaul kit contains the following items.
2. 4T65E-HD MN7 Transmissions and Torque Converters Two major components of the car reside along the drivetrain between your engine and your wheels - the transmission and the torque converter. LS4s come from the factory mated with 4T65E-HD MN7 transmissions; they're automatic transmissions that have 4 forward gears, are transverse mounted, come.

Our 4T65E transmission just went on sale! This amazing 4-speed automatic transmission comes stock in 24 different vehicle applications from Buick, Chevy, Oldsmobile and Pontiac. Its wide production run lasted from 1995 to 2012. Every unit comes with a performance built 4T65E lock up transfer case and a load of upgrades.

This transaxle is a fully automatic and electronically controlled. Shifts are all controlled by the pcm by two shift solenoids, line pressure is also fully electronic and controlled by a Pressure Control Solenoid, or EPC which is commanded by the pcm. This transaxle also employs the use of a Torque Converter Clutch, or TCC and is used to further enhance gas mileage and keep engine rpms lower. The TCC style in this trans is a PWM type, which stands for Pulse Width Modulation. This style PWM TCC system was developed to allow for a smooth engagement of lockup and allows constant slippage of the TCC and can apply in 2nd through 4th gears. The constant slippage is tolerable to the converter because of a special TCC lining developed especially for this purpose and is called a Woven lining. An ordinary TCC clutch would burn up and shudder violently if used in this type of system.

-Below are the gear ratios for each gear of the transmission

1st 2.92:1

2nd 1.56:1

3rd 1:1

4th (OD) 0.70:1

Reverse 2.38:1

There are numerous gear ratio combination options for the 4T65E transmission and below are ratio options that can be found

-Final drive-differential ratios

2.86:1 in standard differential only

3.05:1 in standard differential only

3.29:1 in standard differential and also the HD (Heavy Duty) and Volvo version differential

4t65e Transmission Rebuild Kit

-Drive and Driven sprocket combinations and ratios

33 Drive / 37 Driven creates a 0.892:1 ratio

35 Drive / 35 Drive creates at 1.000:1 ratio

37 Drive / 33 Driven creates a 1.121:1 ratio

The Drive and Driven sprocket ratio will directly factor in to calculate the overall transmission ratio. For example most of the Supercharged 3800 powered vehicles come with a 3.29 HD differential but they have a 37/33 sprocket orientation and this will overdrive the transmission and create an overall ratio of 2.93:1

-Here are the resistance specs on the internal solenoids

Connect Pins - Solenoid Resistance at 68*F, 190*F

A-E - 1-2 Shift Solenoid 19-24, 24-31

B-E - 2-3 Shift Solenoid 19-24, 24-31

T-E - TCC/PWM Solenoid 10-12, 13-15

C-D - EPC Solenoid 3-5, 5-6

S-V - Input Speed Sensor 893-1127, 1132-1428

M-L - TFT Sensor 3164-3867, 225-285

Output Speed Sensor - 981-1864

Below are the Torque Specs for the 4T65E:

Bottom Pan Bolts (mid 98+) M6 X 1.0 X 17 106 lb/in

Side Cover Bolts M8 X 1.25 X 25 18 lb/ft

Side Cover Bolts ( Torx head ) M8 X 1.25 X 21 18 lb/ft

Final Drive Housing Bolts M10 X 1.5 X 35 26 lb/ft

Forward Servo Cover Bolts M6 X 1.0 X 20 106 lb/in

Vehicle Speed Sensor Bolt M8 X 1.25 X 12 106 lb/in

Drive Sprocket Support Bolts M8 X 1.25 X 24 18 lb/ft

Manual Shaft Detent Lever Nut M10 X 1.5 23 lb/ft

Line Pressure Test Plug 1/8 - 27 NPTF 12 lb/ft

Cooler Line Fitting into Case (97- early 99) 1/4-18 NPSF 28 lb/ft

Cooler Line Fitting into Case (mid 99- 03) Feed 3/8-18 NPSF 28 lb/ft

Return 1/4-18 NPSF 28 lb/ft

Cooler Line Fitting into Case ( 04+ ) 9/16-18 UNF 18 lb/ft

Accumulator Cover Bolts M6 X 1.0 X 28 106 lb/in

2-1 Manual Servo Cover Bolts M8 X 1.25 X 25 17 lb/in

Oil Pump Cover Retaining Bolt (97-mid 02) - 1 M6 X 1.0 X 20 70 lb/in

Oil Pump Bolts - 9 M6 X 1.0 X 85 106 lb/in

Oil Pump Bolts - 2 M6 X 1.0 X 95 106 lb/in

Valve Body Bolts - 3 M6 X 1.0 X 65 106 lb/in

Valve Body Bolts - 3 M6 X 1.0 X 60 106 lb/in

Valve Body Bolts - 1 M6 X 1.0 X 30 106 lb/in

Valve Body Bolts - 2 M6 X 1.0 X 45 106 lb/in

Valve Body Bolts - 3 M6 X 1.0 X 55 106 lb/in

Valve Body Bolts - 1 M6 X 1.0 X 95 106 lb/in

Valve Body Bolts - 2 M6 X 1.0 X 20 106 lb/in

Valve Body Bolts - 1 M6 X 1.0 X 85 106 lb/in

Valve Body Bolts - 1 M8 X 1.25 X 90 18 lb/ft

4t65e Transmission Pressure Test Ports

Case Cover / Channel Plate Bolt - Torx - 1 M6 X 1.0 X 32 106 lb/in

Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 30 106 lb/in

Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 40 106 lb/in

Case Cover / Channel Plate Bolt - 3 M8 X 1.25 X 50 18 lb/ft

Detent Lever Spring Bolt M6 X 1.0 X 16 106 lb/ft

The 4T65E was a transmission manufactured by General Motors from 1998-2011. It replaced the 4T60E starting in the mid to late nineties. It is designed for transverse mounted engines (front/all wheel drive). That’s what the “T” in it’s name stands for, as opposed to the 4L65E, which is for longitudinal (rear wheel drive) vehicles.

It was an incredibly versatile transmission and could have up to twelve different final drive ratios. This allowed it to go in vehicles as different as the Chevy Uplander to the Oldsmobile Intrigue.

When going to find one in the salvage yard, it pays to make sure that you have one from the vehicle that you are looking to put it in. There are so many combinations of torque converter and electrical connections that it creates many compatibility issues.

4T65E Identification

These transmissions use many different sized torqe converters depending on which application they went originally went in. The easiest way to determine which of the transmissions that you have is to use the RPO codes.

RPO codes can be found on a sticker inside the glove compartment of all modern GM vehicles. Just open it up and look until you see one of these codes. Below you’ll find a list of the codes. this will tell you what version of the transmission you’re looking at.

M15– The M15 was the most common versions of this transmission. It appeared in a heck of a lot of different cars. 245mm torque converter.

M76– This version of the 4T65E has the same converter size as the M15, but has the ability to service all four wheels. 245mm torque converter.

MN3– The MN3 was not very common. It only appeared in the Buick Regal, Park Avenue, and the Oldsmobile Intrigue. 258mm torque converter.

MN7– The MN7 is the high performance version of this transmission commonly known as the 4t65E-HD transmission. It is highly desirable. More on it directly below. 258 mm torque converter.

4T65E-HD

4t65e Transmission Interchange Chart

The 4T65E-HD transmission is the high performance version of the standard 4T65E. It was capable of going behind the LS4 V8, which put down 300+ horsepower at the rear wheels. This makes it far and away the most desirable of the 65E family.

Here are the vehicles that it was found in:

• 2006-2007 Chevrolet Monte Carlos SS
• 2006-2009 Chevrolet Impala SS
• 2005-2008 Pontiac Grand Prix GXP
• 2008-2009 Buick LaCrosse Super

4t65e Transmission Forum

As you can see, this version of the transmission was not available for a long time. If you are looking for one in the salvage yards, check the glove box for the RPO code MN7. You may be better off paying to have your transmission rebuilt by a professional than finding one of these in the wild.

4t65e Transmission Pan