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1988 4+3 transmission problem

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Old Oct 17, 2010 | 10:24 PM
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Default 1988 4+3 transmission problem
I have a 1988 4+3 tran.it has been running great considering 94000 miles.a little while ago when i would push the button on the shifter to engage or disengage the od unit it would not work.sometimes i had to push it several times to get it to work.now i can push on it till doomsday and nothing happens.the fluids are all up to proper levels.when i shift the car into 2nd gear it goes into overdrive,if i step on it,it will downshift into regular 2nd gear and go,if i let up on the gas or shift into 3rd it goes right into od again. any thoughts would be helpful. i think it is the switch.if it is has anyone ever changed one and how hard would it be to do. would really appreciate any help you can give me on this problem thanks mike
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Old Oct 18, 2010 | 08:24 AM
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Originally Posted by hughesm
now i can push on it till doomsday and nothing happens. i think it is the switch.if it is has anyone ever changed one and how hard would it be to do.
If you can solder you can fix for $4
http://www.radioshack.com/product/in...ductId=2062541

If not it will cost you $70
http://www.ecklers.com/corvette-over...late-1988.html

Switch is mounted on shifter shaft at base under boot.
Carefully prise out button, remove metal T locking **** in place, undo **** , remove boot
Unbolt old switch and fit new one.
Last edited by rodj; Oct 18, 2010 at 08:27 AM.
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Old Oct 18, 2010 | 09:07 AM
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http://members.shaw.ca/agent86/OD%20Switch.pdf
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Old May 19, 2013 | 09:00 PM
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Default Switch Number
Originally Posted by rodj
If you can solder you can fix for $4
http://www.radioshack.com/product/in...ductId=2062541

If not it will cost you $70
http://www.ecklers.com/corvette-over...late-1988.html

Switch is mounted on shifter shaft at base under boot.
Carefully prise out button, remove metal T locking **** in place, undo **** , remove boot
Unbolt old switch and fit new one.
Does anyone know where I can purchase the switch at the bottom of the shifter?
Thanks
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Old May 19, 2013 | 09:28 PM
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There is/was a link before to some electronics website that sold the similar switch real cheap. Myself I went with the radioshack one and problem was solved.
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Old May 19, 2013 | 09:37 PM
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Originally Posted by Alf812
Does anyone know where I can purchase the switch at the bottom of the shifter?
Any Mini Momentary Switch ( 3 amp ) will do the job
MUST be momentary operation ; not ON/OFF type

Radioshack #275-1549 or similar

This will require soldering in , the original replacement from Ecklers linked above appear to be no longer available
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Old May 20, 2013 | 04:48 AM
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Exact part is Tyco #1825040-2 (switch only)

Mouser Electronics pn 506-MPA106F04
(800)346-6873

SPDT MOM Panel Mount

Original GM complete harness #14087693

I have both but am holding on to them.

You might get away with backing out the adjustment by a turn.
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Old May 20, 2013 | 05:00 AM
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Default Thanks
Originally Posted by artvette
Exact part is Tyco #1825040-2 (switch only)

Mouser Electronics pn 506-MPA106F04
(800)346-6873

SPDT MOM Panel Mount

Original GM complete harness #14087693

I have both but am holding on to them.

You might get away with backing out the adjustment by a turn.
Thanks Guys or Gals,
I went online and found one at Ecklers. Said it was in stock and shipping. Thanks for your help!
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Old May 20, 2013 | 07:39 PM
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Here is a pretty good How To write-up for you.
Attached Images
File Type: pdf
Overdrive switch replacement.pdf (246.5 KB, 1523 views)
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Old May 20, 2013 | 08:01 PM
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Originally Posted by vetteoz
Any Mini Momentary Switch ( 3 amp ) will do the job
MUST be momentary operation ; not ON/OFF type

Radioshack #275-1549 or similar

This will require soldering in , the original replacement from Ecklers linked above appear to be no longer available
???? Is the switch a make or brake type
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Old May 20, 2013 | 08:26 PM
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Originally Posted by pmihaltian
Here is a pretty good How To write-up for you.
Thanks for your help pmihaltian.
The link will be helpful when I go back together with it.
I'll let you know how it goes when the part arrives.
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Old Sep 1, 2013 | 05:44 PM
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does anyone know where you can buy the pressure switch that goes inside the transmission on the 4+3 1988 corvette.
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Old Sep 1, 2013 | 07:04 PM
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Originally Posted by krmiche
does anyone know where you can buy the pressure switch that goes inside the transmission on the 4+3 1988 corvette.
http://forums.corvetteforum.com/c4-t...ing-parts.html
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Old Sep 16, 2013 | 08:42 AM
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Thanks pmihaltian. Sorry I forgot to get back with you. Got the part in and it worked great. Thanks again for your help!!!
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