TH350 rebuild tech
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To prevent excessive endplay, a pump thrust washer can be installed on top of the input planet, then the regular thrust washer. Then install the small outside snap ring to hold it all in place. | To prevent excessive endplay, a pump thrust washer can be installed on top of the input planet, then the regular thrust washer. Then install the small outside snap ring to hold it all in place. | ||
Check the output shaft for proper rotation, there will be some drag, especially in one direction. | Check the output shaft for proper rotation, there will be some drag, especially in one direction. | ||
| − | Check for excessive output | + | Check for excessive output end play. If end play is excessive, it can be tightened up by dis-assembling and shimming up the output ring gear bearing from the case. |
Now you drop the input ring gear on, spinning into place. | Now you drop the input ring gear on, spinning into place. | ||
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This is part of the process of "dual-feeding" the direct clutches. On a stock rebuild you would normally install this lip seal. | This is part of the process of "dual-feeding" the direct clutches. On a stock rebuild you would normally install this lip seal. | ||
You can do this on any rebuild but you must also block a passage in the case near the pump to prevent loss of pressure to the reverse circuit. | You can do this on any rebuild but you must also block a passage in the case near the pump to prevent loss of pressure to the reverse circuit. | ||
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| + | ==Dual Feed direct drum== | ||
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Dual feeding doubles the area of the piston that has pressurized fluid on it in 3rd gear, more than doubling the capacity of the clutch. It is accomplished by most valve body kits without doing so internally but requires a "transfer" plate and gasket to be added under the support plate in front of the valve body. | Dual feeding doubles the area of the piston that has pressurized fluid on it in 3rd gear, more than doubling the capacity of the clutch. It is accomplished by most valve body kits without doing so internally but requires a "transfer" plate and gasket to be added under the support plate in front of the valve body. | ||
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Here is the passage that must be blocked. I usually tap this hole with a 3/8" tap, and cut off the end of a 3/8" bolt. I then slot the head of the bolt so I can use a flat-tip screwdriver. | Here is the passage that must be blocked. I usually tap this hole with a 3/8" tap, and cut off the end of a 3/8" bolt. I then slot the head of the bolt so I can use a flat-tip screwdriver. | ||
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I don't thread the passage completely to bottom. I want the "plug" to seat on the unthreaded portion. | I don't thread the passage completely to bottom. I want the "plug" to seat on the unthreaded portion. | ||
| + | [[file:Dualfeed.jpg]] | ||
Also of note, | Also of note, | ||
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Once you have the piston seated in the drum you can install the return springs and retainer. | Once you have the piston seated in the drum you can install the return springs and retainer. | ||
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| + | [[file:TH350directspringtool.jpg]] | ||
You can buy or make a tool similar to the one pictured or use 2-3 5" or larger c-clamps (much more of a PITA). | You can buy or make a tool similar to the one pictured or use 2-3 5" or larger c-clamps (much more of a PITA). | ||
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