Editing TH700R4 through 4L70E tips and tricks
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*These transmissions use METRIC fasteners exclusively. | *These transmissions use METRIC fasteners exclusively. | ||
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==Rebuild manual== | ==Rebuild manual== | ||
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===External cooler=== | ===External cooler=== | ||
− | 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 160º F. An external transmission cooler will help to prevent ATF breakdown and torque converter "ballooning" or expansion which will cause (catastrophic) pump bushing failure. Use the largest external cooler that will fit and not block radiator airflow | + | 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 160º F. An external transmission cooler will help to prevent ATF breakdown and torque converter "ballooning" or expansion which will cause (catastrophic) pump bushing failure. Use the largest external cooler that will fit and not block radiator airflow. |
===2nd gear Servo=== | ===2nd gear Servo=== | ||
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[[file:700r4_servos.jpg]] | [[file:700r4_servos.jpg]] | ||
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== Pump modifications == | == Pump modifications == | ||
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− | ===Stake the pump bushing (for pre-1987 model year 700R4 )=== | + | ===Stake the pump bushing (for pre-1987 model year 700R4)=== |
Photo shows drill bit location to stake bushing. Pump bushing is removed for this operation. 1/4 inch drill bit works well here. | Photo shows drill bit location to stake bushing. Pump bushing is removed for this operation. 1/4 inch drill bit works well here. | ||
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[[Image:Stakebush.jpg]] | [[Image:Stakebush.jpg]] | ||
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===Pump rotor clearance check=== | ===Pump rotor clearance check=== | ||
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[[file:700r4_rotor_clearance01.jpg]] | [[file:700r4_rotor_clearance01.jpg]] | ||
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==Pressures== | ==Pressures== | ||
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*[http://purplesagetradingpost.com/sumner/techinfo/700R4p1.html 700R4 Tech Info] | *[http://purplesagetradingpost.com/sumner/techinfo/700R4p1.html 700R4 Tech Info] | ||
*[http://www.hotrodders.com/articles/TH-700R4_basics.html TH-700R4 Basic Information] | *[http://www.hotrodders.com/articles/TH-700R4_basics.html TH-700R4 Basic Information] | ||
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+ | {{youcanedit}} | ||
+ | [[Category:GM]] | ||
+ | [[Category:Transmission]] |