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Topic: Doug Nash 4+ 3

in Forum: C4 Driveline Components

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Doug Nash 4+ 3 (1/5)
5/9/16 11:15am

Cbarison
Standard Member
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Eastchester, NY - USA

Vette(s):
1987 c4

Joined: 6/25/2014
Posts: 31

Hi all,

So the overdrive on my '87 vette has stopped working, the light in the dash won't come on and nothing happens when I push the overdrive button.

I've got the service manuals but, they don't have any info on troubleshooting the overdrive relay or the wires that go into the overdrive relay. I've replaced the relay but the problem persists. Does anyone know if the wiring going into the relay can be checked with a test light or a voltmeter? Strange that the service manual has detailed info on checking the cooling fan relay but zip on the overdrive relay.

I'd rather troubleshoot that area then check out all of the switched on the transmission. Has anyone seen a troubleshooting tree on the overdrive relay?

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Re: Doug Nash 4+ 3 (2/5)
5/10/16 6:54pm

Adams' Apple
Standard Member
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Duncanville, TX - USA

Vette(s):
1985 Coupe-L98/Auto,Bright Red/Carmine. 1974 Coupe-L48/4speed, Medium Red Metallic/Black Deluxe.

Joined: 3/18/2009
Posts: 2246

I have the Nash OD troubleshooting charts on My Web Page, if it helps. Thumbs Up

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Joel Adams
My Link

(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Re: Doug Nash 4+ 3 (3/5)
11/11/16 8:16am

Cbarison
Standard Member
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Eastchester, NY - USA

Vette(s):
1987 c4

Joined: 6/25/2014
Posts: 31

Thanks but I've got the service manual.

Cbarison

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Re: Doug Nash 4+ 3 (4/5)
1/11/21 5:57am

mturne6
Former Member
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bentonville, AR - USA

Vette(s):
1984 Corvette Doug Nash

Joined: 1/10/2021
Posts: 1

Hi Joel,

The first page of the troubleshooting schematic opens and looks great! I cannot get the second page to open. I have an 84. I figure it is similar.

Thanks for posting this,

Mike

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Re: Doug Nash 4+ 3 (5/5)
1/11/21 6:52pm

Ooopsie!! Page has been fixed, and wiring diagram added.

______________

Joel Adams
My Link

(click for Texas-sized view!) NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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