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

4TH Gear Switch N.O.???

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Old Mar 5, 2003 | 11:29 PM
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VetNutJim
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Default 4TH Gear Switch N.O.???

RE: 91 Vette 700R4

I know what the 4th gear switch is.
Mine is closed until 4th gear then it opens providing the signal to the ECM the transmission is in 4th gear.

Should this parameter be checked in TunerCats or Unchecked?
I think this is the wording:

X 4th Gear Switch N/O

Seems as if I should REMOVE the X....

What do you guys have for this parameter???

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Old Mar 6, 2003 | 11:39 PM
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VetNutJim
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Joined: May 1999
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From: Atlantis
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Default Re: 4TH Gear Switch N.O.??? (VetNutJim)

HERE'S The answer...(since no one answered)
I just got a brandy new 4th gear switch.

It's normally CLOSED. It OPENS when the transmission is in 4th gear.
Sends this signal to the ECM. I think it's primally used as one of the parameters the ECM uses for TC lockup.

I just replaced my 4th gear switch, overtemp switch, TCC lockup solenoid, lockup harness and case connector.
I now have control of TCC with via EPROM programming. :hurray:
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