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Author Topic: speedo cable  (Read 5434 times)

Offline 1979C20

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  • Kyle Taulton.
speedo cable
« on: December 11, 2010, 04:37:38 pm »
Since I got my truck running, the speedo has been starting to bounce more and more. And, its 5 mph slow. 50 on my speedo is actually 45. How can I calibrate it and how can I make it stop bouncing? 79 c20 350 sm456 4spd mantrans, 4.10 or 4.11 gears stock.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline topp

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Re: speedo cable
« Reply #1 on: December 11, 2010, 05:59:19 pm »
Lube the cable....

If that doesn't work, replace the cable....
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'90 Suburban TBI 350

Offline 1979C20

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Re: speedo cable
« Reply #2 on: December 11, 2010, 06:14:37 pm »
How do you lube the cable, kind sir?
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline topp

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Re: speedo cable
« Reply #3 on: December 11, 2010, 06:40:15 pm »
Remove cable from back of speedo...
Spray lubricant (I use any kind of spray oil) down inside sheath of cable.
Reconnect....

Drive around the block, repeat...

Do it 3-4 times and then give it a decent run....
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'90 Suburban TBI 350

Offline 1979C20

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Re: speedo cable
« Reply #4 on: December 11, 2010, 07:07:37 pm »
So, I have to pull my dash apart?
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline topp

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Re: speedo cable
« Reply #5 on: December 11, 2010, 07:12:18 pm »
Remove Bezel....
Unbolt cluster.
Pull cluster forward while reaching behind speedo and unclip cable...
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'90 Suburban TBI 350

Offline captain carnage

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Re: speedo cable
« Reply #6 on: December 11, 2010, 08:20:06 pm »
If your flexible you can reach in behind and do it with out taking anything apart.
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Offline 1979C20

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Re: speedo cable
« Reply #7 on: December 12, 2010, 12:01:03 am »
captain, I don't know about that. I'm a fat kid. Hahaha.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline 1979C20

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Re: speedo cable
« Reply #8 on: December 12, 2010, 01:03:52 am »
Would 3in1 oil work? Or triflow? Or WD-40?
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Captkaos

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Re: speedo cable
« Reply #9 on: December 12, 2010, 11:43:27 pm »
I use white lithium grease, WD-40 and 3-in-1 aint going to work.
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Offline 1979C20

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Re: speedo cable
« Reply #10 on: December 13, 2010, 01:03:33 am »
Alright. Ill grab a can of white lithium. Thanks.
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1979 SCLB C20 Q-jet 350 SM465 14b F.F. 4.10 G80
1989 GMC Suburban V2500 TBI350 TH400 4in lift 35's 14b SF

Offline Blue 82

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Re: speedo cable
« Reply #11 on: December 13, 2010, 03:40:44 pm »
I took an old speedo drive, the part that goes into the tranny,
and threaded a Zerk fitting into the end,
I remove the speedo cable from the tranny,
screw it into the moded speedo drive,
and hit it with a pump or two from the grease gun every other year. (light waterproof outboard motor grease)

If it's your first time you might need three or for pumps to keep it from jumping.
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82 stepside 2wd 355/th350/3.08 posi
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