TH700R4 through 4L70E tips and tricks
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The 3-4 clutch pack in these transmissions have been a problem area since production release in 1981. | The 3-4 clutch pack in these transmissions have been a problem area since production release in 1981. | ||
| − | Various 3-4 clutch pack kits are offered. '''Z-Pak''' from '''Raybestos''' is a high energy material single sided friction plates , '''ALTO''' offers a kit with single sided red friction material friction plates. Also available | + | Various 3-4 clutch pack kits are offered. '''Z-Pak''' from '''Raybestos''' is a high energy material single sided friction plates , '''ALTO''' offers a kit with single sided red friction material friction plates. Also available are "Commercial Duty" 3-4 clutch packs that allows up to 9 friction clutches and steels for the 3-4 clutch pack. These 3-4 clutch upgrades are considered a heavy duty upgrade and will save the transmission in the event of the governor sticking in 3rd gear. |
Clearance on the 3-4 clutch pack frictions should be in the area of .050 to .070 . This can be adjusted via thin or thicker friction plates or steel plates | Clearance on the 3-4 clutch pack frictions should be in the area of .050 to .070 . This can be adjusted via thin or thicker friction plates or steel plates | ||
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In a pre-1987 700r4 - 4L60 trans a larger low-reverse boost valve will hold off the auto upshift to 2nd gear while the shifter is in manual 1st gear | In a pre-1987 700r4 - 4L60 trans a larger low-reverse boost valve will hold off the auto upshift to 2nd gear while the shifter is in manual 1st gear | ||
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| + | *External Cooler; | ||
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| + | The key to longevity in any automatic transmission is to keep the fluid cool; therefore installing an external bypass cooler is recommended. The Factory Transmission coolers are an integral part of the radiator and will only cool the fluid in accordance with the engine temperature. transmission fluid life decreases as temperatures rise above 160(f) an external transmission cooler will help to prevent trans fluid breakdown and Torque converter " Ballooning" or expansion which will cause the (catastrophic) pump bushing failure. Use the largest external cooler that will fit and not block radiator airflow. | ||
== Pump modifications == | == Pump modifications == | ||
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