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

4+3 is shifting in FIRST !!! ???

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Old Sep 11, 2008 | 10:01 AM
  #1  
Johnny0110's Avatar
Johnny0110
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From: Flat Rock MI
Default 4+3 is shifting in FIRST !!! ???

Hey guys,

I got one for ya.... I have 85 with the 4+3 trans. I just did a tune up and changed the trans filter and fluids. Now when I have the OD on it is changing gears in FIRST gear?? Whats up with that? AS soon as I get the clutch out and start rolling in first gear, it jumps into another gear like it would if I were in second gear. I heard it might have something to do with some kick down adjustment?

Im no mechanic by far, (thats why Im here) lol.....

Any ideas whats going on or how to fix this?

Thanks!!!

JT
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Old Sep 11, 2008 | 10:42 AM
  #2  
tequilaboy's Avatar
tequilaboy
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From: Lakeville MI
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An 85 should have a 1st gear switch that lets the ecm know when its in 1st gear.

During your recent service, you may have disconnected the switch somehow.
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Old Sep 11, 2008 | 11:16 AM
  #3  
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Johnny0110
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From: Flat Rock MI
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Originally Posted by tequilaboy
An 85 should have a 1st gear switch that lets the ecm know when its in 1st gear.

During your recent service, you may have disconnected the switch somehow.
Any idea where that switch is?

JT
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Old Sep 11, 2008 | 11:28 AM
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JLeatherman
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From: MD
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The switch is one of three that are on the side-plate of the transmission where the shift-linkages enter (driver's side as I recall).
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