4T65E Transmission Info
I found this info @ Triple Edge Performance - Home Page and thought that it would be well received here.

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 send us an email for more detailed information.

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 vilently 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 numorous 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

-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 Shift Solenoid Patterns for each gear

A-E 1-2 Shift Solenoid 19-24 24-31 Range 1-2 Solenoid 2-3 Solenoid
B-E 2-3 Shift Solenoid 19-24 24-31 Park ON ON
T-E TCC/PWM Solenoid 10-12 13-15 Reverse ON ON
C-D EPC Solenoid 3-5 5-6 Neutral ON ON
S-V Input Speed Sensor 893-1127 1132-1428 1st Gear ON ON
M-L TFT Sensor 3164-3867 225-285 2nd Gear OFF ON
Output Speed Sensor 981-1864 3rd Gear OFF OFF
4th Gear ON OFF
Below are the Torque Specs for the 4T65E

Description Thread Size Lb.Ft. Lb.In.

Bottom Pan Bolts (mid 98+) M6 X 1.0 X 17 10
Side Cover Bolts M8 X 1.25 X 25 18
Side Cover Bolts ( Torx head ) M8 X 1.25 X 21 18
Final Drive Housing Bolts M10 X 1.5 X 35 26
Forward Servo Cover Bolts M6 X 1.0 X 20 106
Vehicle Speed Sensor Bolt M8 X 1.25 X 12 106
Drive Sprocket Support Bolts M8 X 1.25 X 24 18
Manual Shaft Detent Lever Nut M10 X 1.5 23
Line Pressure Test Plug 1/8 - 27 NPTF 12

Cooler Line Fitting into Case (97- early 99) 1/4-18 NPSF 28
Cooler Line Fitting into Case (mid 99- 03) Feed 3/8-18 NPSF
Return 1/4-18 NPSF
Cooler Line Fitting into Case ( 04+ ) 9/16-18 UNF

Accumulator Cover Bolts M6 X 1.0 X 28 106
2-1 Manual Servo Cover Bolts M8 X 1.25 X 25 17

Oil Pump Cover Retaining Bolt (97-mid 02) - 1 M6 X 1.0 X 20 70
Oil Pump Bolts - 9 M6 X 1.0 X 85 106
Oil Pump Bolts - 2 M6 X 1.0 X 95 11

Valve Body Bolts - 3 M6 X 1.0 X 65 106
Valve Body Bolts - 3 M6 X 1.0 X 60 106
Valve Body Bolts - 1 M6 X 1.0 X 30 106
Valve Body Bolts - 2 M6 X 1.0 X 45 106
Valve Body Bolts - 3 M6 X 1.0 X 55 106
Valve Body Bolts - 1 M6 X 1.0 X 95 106
Valve Body Bolts - 2 M6 X 1.0 X 20 106
Valve Body Bolts - 1 M6 X 1.0 X 85 106
Valve Body Bolts - 1 M8 X 1.25 X 90 18

Case Cover / Channel Plate Bolt - Torx - 1 M6 X 1.0 X 32 106
Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 30 106
Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 40 106
Case Cover / Channel Plate Bolt - 3 M8 X 1.25 X 50 18
Detent Lever Spring Bolt M6 X 1.0 X 16 106

 

Manufacturer Model Year Range Transmission

Buick Century 2000-2004 4T65E
Buick LaCrosse,Allure 2005-2008 4T65E. 4T65E-HD
Buick Lesabre 1998-2005 4T65E
Buick Lucerne w/3.8 V6 2006-2008 4T65E
Buick Park Avenue 1997-2004 4T65E, 4T65E-HD
Buick Regal 1997-2004 4T65E, 4T65E-HD
Buick Rendezvous 2002-2007 4T65E, 4T65E-AWD
Buick Riviera 1997-1999 4T65E, 4T65E-HD
Buick Terraza 2005-2007 4T65E, 4T65E-AWD

Chevrolet Impala 2000-2008 4T65E, 4T65E-HD
Chevrolet Lumina 2000-2001 4T65E
Chevrolet Malibu SS 2006-2007 4T65E
Chevrolet Monte Carlo 1998-2007 4T65E, 4T65E-HD
Chevrolet Uplander 2005-2008 4T65E, 4T65E-AWD
Chevrolet Venture 1999-2005 4T65E

Oldsmobile 88 Royal 1997-1999 4T65E, 4T65E-HD
Oldsmobile Aurora w/3.5 2001-2003 4T65E
Oldsmobile Intrigue 1998-2002 4T65E
Oldsmobile Silhouette 1999-2004 4T65E

Pontiac Aztec 2001-2005 4T65E, 4T65E-AWD
Pontiac Bonneville w/3.8 V61997-2005 4T65E, 4T65E-HD
Pontiac G6 w/3.9 V6 2006-2008 4T65E
Pontiac Grand Prix 1997-2008 4T65E, 4T65E-HD
Pontiac Montana 1999-2007 4T65E, 4T65E-AWD

Saturn Relay 2005-2007 4T65E, 4T65E-AWD

Volvo S80 1999-2002 4T65EV, 4T65EV/GT
Volvo XC90 2003-2005 4T65EV, 4T65EV/GT

 

i just read your article about the 4t65e-transaxle,i have a 2004 monte ss supercharged/4t65e-hd trans i always thought the diff. ratio was 2.93,and the standard 4t65e na cars got the 3.29 diff. your article states the supercharged cars have a 3.29 diff, and a overall overdrive ratio of 2.93. doe's GM list the overdrive ratio in there vehicle's spec's,or the actual diff. ratio? all of a sudden i'm confused, any help clarifying this would be greatly appreciated, Thanks for your time

 

I found the info and wanted to supply a common source for the info.
I hope that someone else on here will be able to help answer your question.

-Good Luck

 

I'm glad I stumbled upon this post; I had the exact same question.

I have a 2005 Monte (super charged / SS) it has the 4T65E-HD transmission.

According to the new-cars article: 2005 Chevrolet Monte Carlo - Specs, Data "Final drive ratio LA1: 2.86:1 ; L36: 3.29:1 ; L67: 2.93:1"

As far as I know, I have an L67, so that would mean I'm 2.93:1 ... However, I just got an HP scanner & downloaded my stock PCM file. Looking in the "Gear / Tire Calc section; the calculated gear is "3.29" ???

 

Now that's what I need to know I have a 2004 3.8 but not supercharger but the transmission is a 3.29 FR9 4T65E

 

Here's an excerpt from the OP's post that explains this.

So going off this, I'm guessing the N/A 3800s that have a 3.29 final driver ratio have a 35 Drive/35 Driven sprocket combination with the 3.29 diff.

Hopefully that helps y'all with questions about gear ratios.

 

If you have a 2004 Monte SS that is NOT supercharged, you have the L36 that will have a 3.29:1; If you have a standard LS Monte with the 3.4L engine, then 2.86:1 is the number you are looking for...

 

Does anyone know why we have this transmission instead of the 4T-80E? I have a friend with a 99 Aurora (as in, FWD V8) and it;s performed flawlessly for her....