TH400 rebuild tech
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Then using a screwdriver through one of the feed holes in the VB area, force the center support in a counterclockwise direction and tighten the center support bolt. | Then using a screwdriver through one of the feed holes in the VB area, force the center support in a counterclockwise direction and tighten the center support bolt. | ||
| − | + | ===Sprag design comparison=== | |
| + | This next picture shows a common roller clutch style drum and a roller clutch on the left, most TH400's will use this style drum, early units, pre-71 will have the smooth inner race style drum on the right. 4L80-E's also use the "early" style drum and an actual sprag. The stock 16 element sprag is in the center, with the 34 element on the right. | ||
| + | [[file:Sprag-drum-compare.jpg]] | ||
| − | + | ===Spiro loc retainer=== | |
| − | This part is a stock | + | This is a pic of an upgrade for high rpm applications, it is a spiro lock type retainer instead of a regular snap ring. The regular snap rings will release due to centrifugal forces at high rpms. This fits on the direct drum plate that covers the sprag |
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| + | [[file:Spirolock.jpg]] | ||
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| + | This part is a stock 4L80e part available at a GM dealership. | ||
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