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Old 07-26-2007, 08:47 PM
Lilcarrin's Avatar
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Speedometer

i have a problem and i wanted to see if someone had the problem before or knows how to trouble shoot it ...
well my speedometer needle kinda swings and doesn't go over 45 mph ??
anybody had an experience like that before
thanks

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Old 07-27-2007, 06:34 AM
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Hi: Thanks for the question. I am moving your post to General Rodding Tech. I think you will get more and better answers there.

Dan
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Old 07-27-2007, 07:27 AM
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WELCOME to Hotrodders.com

What type of vehicle are we talking about ?

Lots of older vehicles had a mechanical speedometer drive ... with a cable. The cable sometimes needs lubrication ... and sometimes the speedometer head needs attention ...
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Old 07-27-2007, 09:21 AM
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Car Info

sorry ... its an 72 el camino .....with a 350 .. bought it last week
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Old 07-27-2007, 10:16 AM
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See if the cable is kninked any where or frayed. If it looks good remove the inner drive cable and clean it up and lube it lightly with a light grease such as Lubri-plate. Don't lube the last 8 inches or so at the speedo head.
Or just replace the complete cable with a new one.

gcrmcc
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Old 07-27-2007, 11:30 AM
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I've had a similar problem in a couple of cars and it turned out to be the plastic speedometer gears in the trans. What happens is that the speedo cable wears and puts additional drag on the plastic gears. The gears eventually wear out, causing the slippage. Since the gears have trans oil on them, you usually get hydraulic coupling at slower speeds (sort of like a mini torque converter) but as speeds increase the gears just slip. Replace the cable AND the gears.

The speedo driven gear is easy, since you get at it by simply removing the retainer on the side of the trans. The speedo drive gear is on the output shaft of the trans (except for the 200-4R transmission) and requires the tailhousing to be removed first.
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Old 07-27-2007, 01:32 PM
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http://www.redrider.us/Speedometer_Gears.htm#350
for a look at the inside and to get parts
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Old 07-27-2007, 01:54 PM
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Quote:
Originally Posted by Cape Cod Bob
http://www.redrider.us/Speedometer_Gears.htm#350
for a look at the inside and to get parts
That's actually where I got my gears...
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