1988 4+3 transmission problem

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Oct 17, 2010 | 10:24 PM

hughesm

Thread Starter

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Joined: Jun 2010

Posts: 60

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From: auburn ma

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

Oct 18, 2010 | 08:24 AM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

Quote:

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.

Oct 18, 2010 | 09:07 AM

AGENT 86

Team Owner

Joined: Jan 2003

Posts: 20,275

Likes: 236

From: Summerland B.C. Canada

http://members.shaw.ca/agent86/OD%20Switch.pdf

May 19, 2013 | 09:00 PM

Alf812

4th Gear

Joined: May 2013

Posts: 4

Likes: 0

From: 5011 Criddle Drive, Columbia, TN 38401

Switch Number

Quote:

Originally Posted by rodj

Does anyone know where I can purchase the switch at the bottom of the shifter?
Thanks

May 19, 2013 | 09:28 PM

black88z51

Racer

Joined: Oct 2004

Posts: 409

Likes: 2

From: Toronto Ontario

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.

May 19, 2013 | 09:37 PM

vetteoz

Safety Car

Joined: Jan 2004

Posts: 3,556

Likes: 12

Quote:

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

May 20, 2013 | 04:48 AM

artvette

Pro

Joined: Nov 2004

Posts: 641

Likes: 3

From: Long Island NY

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.