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

700r4 help

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Old May 23, 2007 | 09:09 PM
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davekymmy
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Default 700r4 help

ok i got one i need some help with, heres whats going on shifts fine 1-3 then lock up on third and doesn't shift into fourth until 65-70mph, had tranny rebuilt, new torque convert, new tv (shift) cable and still does the same thing. tran shop said to drive it to see if it would come out of it. he also said to put a switch inline to the lockup to disengage it. i was told there is a pressure switch that is activated in the trans to go into fourth. the shift cable has be adjusted several times (3-4). any ideas?
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Old May 23, 2007 | 09:20 PM
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Originally Posted by davekymmy
ok i got one i need some help with, heres whats going on shifts fine 1-3 then lock up on third and doesn't shift into fourth until 65-70mph, had tranny rebuilt, new torque convert, new tv (shift) cable and still does the same thing. tran shop said to drive it to see if it would come out of it. he also said to put a switch inline to the lockup to disengage it. i was told there is a pressure switch that is activated in the trans to go into fourth. the shift cable has be adjusted several times (3-4). any ideas?
There is no pressure switch to control the 3-4 shift.
Sounds like a valve body issue. Common after a rebuild. Sometimes, a small amount of residual trash works loose in the valvebody, and causes small shift problems. If you are confident the tv adjustment is correct, run it. It may clear up.
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Old May 23, 2007 | 11:04 PM
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Originally Posted by Pete K
There is no pressure switch to control the 3-4 shift.
Sounds like a valve body issue. Common after a rebuild. Sometimes, a small amount of residual trash works loose in the valvebody, and causes small shift problems. If you are confident the tv adjustment is correct, run it. It may clear up.
just hate runnin 55 in third with the shift light sayin shift up
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Old May 24, 2007 | 12:22 AM
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Originally Posted by davekymmy
just hate runnin 55 in third with the shift light sayin shift up
What shift light are you talking about ?
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Old May 25, 2007 | 09:28 PM
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Originally Posted by JD'S WHITE 93
What shift light are you talking about ?
the upshift light/indicater in the lcd dash
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