speedometer

Corvette Forums Corvette Classifieds Gallery Corvette News Member List Search Sponsors
Forum FAQ Calendars Contact Us Corvette Recalls TSBs Corvette Timeslips Register Login

speedometer

Printable Version

Corvette Forum >> Corvette Models >> Corvette C3 Forum >> speedometer

Page: [1]

Message

<< Older Topic Newer Topic >>

speedometer - 4/20/2008 9:52:51 AM

orangevette

Posts: 9
Joined: 4/20/2008
Status: offline

my C3, 1974, speedometer does not work. The tach works fine. How do I get the speedometer to work again. Any help out there would be great.

Post #: 1

RE: speedometer - 4/20/2008 9:58:32 AM

C3 Starship

Posts: 4656
Joined: 7/25/2006
Status: offline

As I recall, the speedos are all cable drive. You could have a broken cable. The cable is in a sleeve that runs from the tranny to the speedo.
You can disconnect it from the tranny and pull the inner cable out.

_____________________________

1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response.
400+ hp, 454, M-22, 3.07

http://i121.photobucket.com/albums/o225/C3Starship/Patch.jpg

2007 H. D. Sportster, XL 883 EFI

(in reply to orangevette)

Post #: 2

RE: speedometer - 4/20/2008 10:33:55 AM

SCHOON

Posts: 284
Joined: 9/8/2006
Status: offline

It's a bitch getting under the dash.
Might find pulling the drivers seat out will make it easier for you.

(in reply to orangevette)

Post #: 3

RE: speedometer - 4/20/2008 11:48:28 AM

73shark

Posts: 1000
Joined: 4/18/2006
Status: offline

On my '73, I had to pull the cable out from the speedo end as there is a flange on it that prevents it from coming out at the tranny end.

BTW, welcome to the Corvette forum.

_____________________________

So many toys, so little time

(in reply to orangevette)

Post #: 4

RE: speedometer - 4/20/2008 1:35:48 PM

C3 Starship

Posts: 4656
Joined: 7/25/2006
Status: offline

By gollly 73shark,....that's right.

If the cable is broken inside the sleeve, you'd have to pull it out from both ends though.

....and yes orangevette, welcome to CF!

(in reply to 73shark)

Post #: 5

RE: speedometer - 4/20/2008 3:19:32 PM

Wedge

Posts: 192
Joined: 11/3/2005
Status: offline

Check the drive gear on the tranny before you go to all the trouble of pulling the cable. The gears are nylon and they do wear out. Make sure you get the right one, the 22 tooth tan one is for stock sized tires. Get the wrong one and you might see some blue lights in your rear view... speaking from experience...

(in reply to C3 Starship)

Post #: 6

RE: speedometer - 4/20/2008 6:47:39 PM

73shark

Posts: 1000
Joined: 4/18/2006
Status: offline

The driven gear (nylon) on a '73 4 speed with the stock GR-70 tires was a 22 tooth (P/N 3987922) for a 4.11 rear gear. The 3.70 used a 20 tooth (P/N 3987920), 3.56 used a 19 tooth (P/N 3987919), and 3.36 used a 18 tooth (P/N 3987918).

Disclaimer: these P/Ns are from a Chevy Parts catalog circa 1976, so they might have to be updated by your parts guy or they may no longer be available.

C3: Good catch, I missed the part about broken, was just thinking about removing an intact cable.

_____________________________

So many toys, so little time

(in reply to Wedge)

Post #: 7