![]() ![]() There are numerous gear ratio combination options for the 4T65E transmission and below are ratio options that can be foundģ.29:1 in standard differential and also the HD (Heavy Duty) and Volvo version differential Below are the gear ratios for each gear of the transmission An ordinary TCC clutch would burn up and shudder violently if used in this type of system. 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. 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 TCC style in this trans is a PWM type, which stands for Pulse Width Modulation. 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. 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 is a fully automatic and electronically controlled. If you have a question about something that you do not see on this page feel free to contact us. 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. 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. ![]()
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