General Motors transmissions
(→TH400 (3L80), TH375C, TH475 (3L80HD): Add SP info) |
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For all intents and purposes the Turboglide is a 3 speed automatic with no apparent shift points. The 1958 and later Turboglide replaced the cone clutch with the more common and durable plate clutches. This resolved the reliability problems- but the image of a problematic transmission was cast. | For all intents and purposes the Turboglide is a 3 speed automatic with no apparent shift points. The 1958 and later Turboglide replaced the cone clutch with the more common and durable plate clutches. This resolved the reliability problems- but the image of a problematic transmission was cast. | ||
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| − | The 1957 trans is visually different from the later trans in that it has a pair of cast transmission mounts on its | + | The 1957 trans is visually different from the later trans in that it has a pair of cast transmission mounts on its bellhousing: large flat surfaces cast at 45 degrees from the horizontal on the underside of the bellhousing. This is because the 1955-'57 Chevys had a perimeter frame and leaf rear springs. These had a 3 point engine/trans mounting system that required a single front engine mount and 2 bellhousing mounts. The 1957 trans is unique in that it also has a long extension housing (tail shaft housing) and a drain plug that the later trans do not. This makes it fairly easy to identify. |
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| − | The 1958 and later Turboglides have a very short tail shaft, no mounts on the | + | The 1958 and later Turboglides have a very short tail shaft, no mounts on the bellhousing and no drain plug in the pan. All of the Turboglide trannys function the same with only detail changes between them to improve reliability. |
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They all have a variable pitch (angle of incidence) stator in the center of the torque converter that changes the torque multiplication when the angle is changed. This feature gave the trans the feel of having a 'passing gear' when the throttle was fully depressed- causing he engine RPM to rise by 500-800. This feature could be found in some of the later GM transmissions and was discontinued at the end of the 1970s. | They all have a variable pitch (angle of incidence) stator in the center of the torque converter that changes the torque multiplication when the angle is changed. This feature gave the trans the feel of having a 'passing gear' when the throttle was fully depressed- causing he engine RPM to rise by 500-800. This feature could be found in some of the later GM transmissions and was discontinued at the end of the 1970s. | ||
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===Uni-bell pattern=== | ===Uni-bell pattern=== | ||
| − | This photo shows a multi-pattern case. Both the BOP and Chevrolet pattern on the same | + | This photo shows a multi-pattern case. Both the BOP and Chevrolet pattern on the same bellhousing. |
[[image:Multi_pattern_bell.jpg|thumb|left|300px|Uni-bell pattern]] | [[image:Multi_pattern_bell.jpg|thumb|left|300px|Uni-bell pattern]] | ||
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