C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

700r4 Torque Converter Question

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Old Jun 19, 2012 | 08:44 AM
  #21  
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sonnax makes more than servos they make parts to fix worn items in transmissions they sell a lock up valve that goes in the pump to correct hot lock up malfunctions
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Old Jun 19, 2012 | 07:56 PM
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Originally Posted by mistaben
lets say this happens at around 4000RPM and you get an engine RPM rise to 4500RPM...would that be the transmission slipping or the torque converter disengaging... ?
It appears to be slippage rather than the TC unlocking.

I can't say if the slippage is a transmission or TC problem.
This will be part of the troubleshooting checklist.

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Old Jun 20, 2012 | 12:42 AM
  #23  
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tcc slippage is rare on a 700r the newer 4l60e had tcc lock up problems
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Old Jul 13, 2012 | 12:48 AM
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Finally got a diagnostic check on the tranny.

Bottom line is the pump is not making enough pressure. Main pressure should be approximately 150 lbs and its making 120-135 maximum. Changes to the TV cable have little effect. Reverse should be 100 psi and we're seeing 40.

So the tranny comes out again. New pump and TC on order.
Looking forward to getting back on the road.

On the bright side the tech that drove the road test came back with this big s**t eating grin on his face. I knew he had way too much fun when I later noticed he burned almost a 1/4 tank of fuel for a 20 mile road test

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