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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[[Image:Stakebush.jpg]] | [[Image:Stakebush.jpg]] | ||
− | ;{{Note1}} The #732 pump (manfactured since October 1986 which includes some early 4L60Es without the 2 piece bellhousing) has a cast in step to help retain the bushing. The early pump had an issue with the pump bushing walking out, requiring staking and/or Loctiting it in place. Also, the #732 pump has an additional oil drain hole which is a connection for the oil transfer tube used with the auxillary valve body. The early and late pumps do not interchange (same with the pre- and post-October 1986 transmission cases (the late 1988-1993 cases have a "St. Louis Gateway" arch casting and the absence of 3 oil pressure fittings) | + | ;{{Note1}} The #732 pump (manfactured since October 1986 which includes some early 4L60Es without the 2 piece bellhousing) has a cast in step to help retain the bushing. The early pump had an issue with the pump bushing walking out, requiring staking and/or Loctiting it in place. Also, the #732 pump has an additional oil drain hole which is a connection for the oil transfer tube used with the auxillary valve body. The early and late pumps do not interchange (same with the pre- and post-October 1986 transmission cases (the late 1988-1993 cases have a "St. Louis Gateway" arch casting and the absence of 3 oil pressure fittings). |
===Pump rotor clearance check=== | ===Pump rotor clearance check=== | ||
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===Speedometer/speed sensor=== | ===Speedometer/speed sensor=== | ||
− | Some GM vehicles (GMT400 trucks, S10s and Astro/Safari vans after 1989, 1990/'91 R/V series trucks (square body SUVs and crew cabs) came with a 40 tooth reluctor wheel (used with a speed sensor and a Digital Ratio Adapter Control (DRAC) module which is matched to the rear differential gear ratio) where the speedometer drive gear is usually located. For older cable driven speedometers, the reluctor wheel can be swapped out. Cable driven speedometers were used to 1990 (B-body) and 1992 (F-bodies) which had a hybrid speedometer gear and VSS housing | + | Some GM vehicles (GMT400 trucks, S10s and Astro/Safari vans after 1989, 1990/'91 R/V series trucks (square body SUVs and crew cabs) came with a 40 tooth reluctor wheel (used with a speed sensor and a Digital Ratio Adapter Control (DRAC) module which is matched to the rear differential gear ratio) where the speedometer drive gear is usually located. For older cable driven speedometers, the reluctor wheel can be swapped out. Cable driven speedometers were used to 1990 (B-body) and 1992 (F-bodies) which had a hybrid speedometer gear and VSS housing. |
==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]] |