TH350 rebuild tech
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Don't assume you need to plug this hole. Only plug this hole if you plan on building a unit yourself. | Don't assume you need to plug this hole. Only plug this hole if you plan on building a unit yourself. | ||
| − | You can omit the center seal, plug this passage, enlarge the 2nd and 3rd feed holes in the stock | + | You can omit the center seal, plug this passage, enlarge the 2nd and 3rd feed holes in the stock separator plate and you will have greatly increased the torque capacity of a stock TH350 as well as gained a firmer shift. |
Even firmer shifts can be accomplished with checkball removal and modifications to the accumulators. I recommend NOT modifying the 1-2 accumulator. Retain the cushion spring and do not block the circuit. The 2-3 accumulator can be blocked by several methods. | Even firmer shifts can be accomplished with checkball removal and modifications to the accumulators. I recommend NOT modifying the 1-2 accumulator. Retain the cushion spring and do not block the circuit. The 2-3 accumulator can be blocked by several methods. | ||
| − | Removing the 2-3 accumulator spring and using a spacer (nut, washers, cut down section of tubing) between the piston and the e-clip is the " | + | Removing the 2-3 accumulator spring and using a spacer (nut, washers, cut down section of tubing) between the piston and the e-clip is the "shade tree' method. You can also block the feed in the valve body to the 2-3 accumulator. |
Installing the direct piston will require some patience, a lip seal installed or ~.010" feeler gauge, and a trick I use is a section of plastic cut from a 3 liter soda bottle to use as an outside installer tool. Set it in the drum, and it will force the lip seal into the drum without using a tool around the entire circumference. You may however need to work the exposed part of the seal into the drum with the feeler gauge or seal tool. | Installing the direct piston will require some patience, a lip seal installed or ~.010" feeler gauge, and a trick I use is a section of plastic cut from a 3 liter soda bottle to use as an outside installer tool. Set it in the drum, and it will force the lip seal into the drum without using a tool around the entire circumference. You may however need to work the exposed part of the seal into the drum with the feeler gauge or seal tool. | ||
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Pump gear install. Note the orientation of the tangs on the inner gear. They are offset. They should face away from the seal. Mis-installation will result in pump failure and converter damage. | Pump gear install. Note the orientation of the tangs on the inner gear. They are offset. They should face away from the seal. Mis-installation will result in pump failure and converter damage. | ||
| − | + | [[file:TH350pumpgears.jpg]] | |
Notice the dowel pins threaded into the case, you use these and the case to align the pump halves. | Notice the dowel pins threaded into the case, you use these and the case to align the pump halves. | ||
| − | + | [[file:TH350pumpalign.jpg]] | |
This is an example of how I air check the forward and direct drum. After everything is assembled, I place the drums on the pump (above a hole in the bench) with all sealing rings in place, thrust washers or bearings. | This is an example of how I air check the forward and direct drum. After everything is assembled, I place the drums on the pump (above a hole in the bench) with all sealing rings in place, thrust washers or bearings. | ||
Use a rubber tipped air nozzle to apply air to the passages around the pump circumference. As you apply air to the correct passages, you will see and hear the drums apply the clutches. Be sure there are no leaks from the lip seals. There will be some minor leakage at the sealing rings usually. Iron rings air check better than teflon on the bench. | Use a rubber tipped air nozzle to apply air to the passages around the pump circumference. As you apply air to the correct passages, you will see and hear the drums apply the clutches. Be sure there are no leaks from the lip seals. There will be some minor leakage at the sealing rings usually. Iron rings air check better than teflon on the bench. | ||
| − | + | [[file:TH350aircheck.jpg]] | |
Drums installed in the transmission. Ready for intermediate pressure plate install. Ensure the lugs of the direct drum are engaged with the sun shell. They should be slightly below the top edge of the suin shell. If you do not get complete engagement, the input shaft will not turn when you install the pump and begin to tighten it. | Drums installed in the transmission. Ready for intermediate pressure plate install. Ensure the lugs of the direct drum are engaged with the sun shell. They should be slightly below the top edge of the suin shell. If you do not get complete engagement, the input shaft will not turn when you install the pump and begin to tighten it. | ||
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