Quote:
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Originally Posted by longassname;667126[B
]Replace the fluid but don't bother dropping the pan and changing the filter. It isn't really a filter; it's a wire screen and it doesn't get clogged. It's a waste of a pan gasket and screen.[/B] ,,,,,,,,,,,,,,,,,,,,,,,,,,,.
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Don't agree with this bit on the trans screen. There have been a few that I have heard of that have had the trans fail due to the blocked screen.
http://www.subaru-svx.net/forum/show...+filter+screen
There are probably others that replaced the box due to this happening.
Quote:
Originally Posted by longassname
Upgrade/update your TCU with firmware with higher line pressure in 3rd and 4th gear to prevent high clutch and brake band slipping and eventual failure which otherwise plague SVXs
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The slipping that destroys the band and high clutch, is a combination of high torque and low pressure. The low pressure is really due to the low rpm that the transmission pump runs at, when driving in 4th at low road speeds.
This combined with the high torque that the band and high clutch have to transmit, causes the slipping.
The line pressure can be increased, to add clutch pressure, by increasing the resistance of the dropping resistor. The resistance is 12 ohms increasing this to 25 ohms, by using two dropping resistors connected in series, will raise the pressure by about 30%. Increasing the pressure excessively will cause C and B solenoid binding, and hard changes.
The high torque is instantly reduced by 30% by shifting back to 3rd gear, this changes the overall ratio from 2.4:1 to 3.5 :1, the ATF output is increased by the same amount, and the heat produced by the torque converter is also reduced. It is the excessively high US ratio that has caused so much trouble. This is why fitting on trans that has a lower final drive ratio, like a Legacy 4.11:1 or an Outback 4.44:1, reduces the load on the box by about 17%/26%, results in a longer lasting, better preforming SVX.
Harvey.