Speedo & odometer not working on 64 - Impala Tech
Troubleshooting Diagnosing problems

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post #1 of 5 (permalink) Old 09-29-2010, 03:41 PM Thread Starter
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Speedo & odometer not working on 64

Been doing research and not having any luck. Opinions/advice all over the board.

My speedometer and odometer have never worked on my 64 Impala. Odometer stopped at 24k.

Replaced the Turbo 350 w/ a re-built TB 350 (originally came w/ a Powerglide) and rebulit 327.

My first drive the speedo worked but it wasn't correct. A few minutes later it didn't work at all like usual.

When I first bought the car I removed the speedo from the tranny and (if I remember correctly) my buddy spun it with a power drill and it moved the needle and seemed to work properly at the dash. Didn't pay attention to odometer.

Any ideas on what the solution and/or problem is??
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post #2 of 5 (permalink) Old 09-29-2010, 04:29 PM
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The TH350 will need a conversion gear box that goes between the transmission and the cable to get it to read right. If it works with the drill, then it perhaps the cable is worn or otherwise not connecting to the gear in the transmission. The gear itself in the transmission is plastic, and the hole for the cable could be rounded out from abuse. Likewise somebody could have cut the cable short for some strange reason, leaving it with difficulty contacting the gear.

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post #3 of 5 (permalink) Old 09-29-2010, 09:11 PM Thread Starter
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dcairns...thanks for the reply.

Who sells the conversion box?

Can't be the tranny or the hole. Same problem on 2- different trannys. The catelogs have many different type replacement cable gears not sure which one would work.

Maybe I should try a new cable first.

I see your in Orange, California. Must be nice to have Car Shop in the neighborhood. I order most stuff from CS and Classic. Could save an a$$ load in shipping charges. No shops like that around here. What's your opinion of Car Shop and Classic...quality wise?
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post #4 of 5 (permalink) Old 09-29-2010, 09:43 PM
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Speedo gear

First problem sounds like your cable is not making contact either withe the plastic trans gear or in the speedometer head itself. You need to make sure the thumb screw holding the cable into the speedometer head is seated correctly and screwed in tight. Same for trans end.
The second issue is the wrong reading. This occurs because the 1964 never came with a T350 with 14 inch wheels. See the chart on this website for the closest trans/speedometer gear you can find. It is for a Chevelle but it should be very close:



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post #5 of 5 (permalink) Old 10-01-2010, 07:39 PM Thread Starter
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Thanks Paul. I'll check it out and you know the result.
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