The 4T60E/4T65E/4T65E-HD is a series of automatic transmissions from General Motors. Designed for transverse engine configurations, the series includes 4 forward gears. The 4Txx family is an evolution of the original Turbo-Hydramatic 125 transverse automatic introduced in the late 1970s. 4T65E Transmission The successor to the 4T60E, the 4T65E, like all upgrades, made changes to improve upon its previous incarnation. One such was a larger torque converter in order to increase the stall. All transmissions of this model also received a new valve body to improve on the flow of the fluid that is used.
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.
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-lb1
-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
Case Cover / Channel Plate Bolt - Torx - 1 M6 X 1.0 X 32 106 lb/in
4t65e Fix
Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 30 106 lb/in
Remanufactured 4t65e Transmission For Sale
Case Cover / Channel Plate Bolt - 3 M6 X 1.0 X 40 106 lb/in
4t65e Transmission
Case Cover / Channel Plate Bolt - 3 M8 X 1.25 X 50 18 lb/ft
4t65e Transmission
Detent Lever Spring Bolt M6 X 1.0 X 16 106 lb/ft