General Motors transmissions
m (→Transmission identification by pan shape) |
(→TH400 Switch Pitch: add SP info) |
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[[File:Th400SPpan.jpg|right|260px]] | [[File:Th400SPpan.jpg|right|260px]] | ||
| − | === | + | ===Switch Pitch=== |
| − | Switch Pitch (SP) transmissions were available from 1965-'67 in full size BOCad cars. | + | Switch Pitch (SP) TH400 transmissions were available from 1965-'67 in full size BOCad cars. |
The name "switch pitch" comes from the vanes in the torque converter being able to change their angle (pitch) in order to increase the stall speed to get the vehicle moving easier. | The name "switch pitch" comes from the vanes in the torque converter being able to change their angle (pitch) in order to increase the stall speed to get the vehicle moving easier. | ||
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====SP ID==== | ====SP ID==== | ||
| − | The easiest way to identify the SP is by the pan shape. On the SP TH400, there are 3 concave and 1 convex dimples and a 'shoe heel' impression. The shoe heel impression is where the filter picks up fluid and the pickup is shaped just like a shoe heel (see photo | + | The easiest way to identify the SP is by the pan shape. On the SP TH400, there are 3 concave and 1 convex dimples and a 'shoe heel' impression. The shoe heel impression is where the filter picks up fluid and the pickup is shaped just like a shoe heel (see photo above right). Filter is a Wix p/n 51879. |
| + | |||
| + | The SP transmission has a two-terminal electrical connector on the driver side of the case. The top terminal is for the SP converter: applying 12VDC to it caused the converter to go to the higher stall setting. Default no-power position is low stall. | ||
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| + | The lower terminal is for the kickdown solenoid. | ||
*[http://web.archive.org/web/20070807215149/http://www.buickperformance.com/switchpitch.htm Switch Pitch info] | *[http://web.archive.org/web/20070807215149/http://www.buickperformance.com/switchpitch.htm Switch Pitch info] | ||
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