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Muncie speedometer gear

 
L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/04/13 10:13 PM

My '68 El Camino is just sitting in the garage waiting for me to start restoring it. I've owned it since 1970 when I bought it from a friend who bought it new. It's been sitting in my garage since 1978. I've got a lot of parts gathered up but have too many other things going on to start working on it. I can't help but think about it all the time. It will end up having stock looking exterior/interior but will be kind of pro-street as far as engine performance. I'd like for the speeedometer to work. It has a 25 tooth speedometer gear in it now which is accurate with the 4.10 diff gears it came with. I'm going change to 4.56 or 4.88 gears and am wondering if they make a speedometer gear for either of those ratios. Does anybody know?

Thanks,
Victor  

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tuffnuff
Moderator
Posts: 7841
Joined: 12/09
Posted: 03/05/13 12:00 AM

Speedometer adapters are available.

Click on links:

http://www.transmissioncenter.net/speedometer_calibration_______va.htm

http://www.summitracing.com/search/Part-Type/Speedometer-Cable-Adapters

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

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L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/05/13 05:39 PM

Thanks!  

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L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/05/13 05:47 PM

Thanks for the reply but no luck finding any gears for the Muncie 4 sp. If I can afford it I will have a Gear Vendors overdrive unit which should have it's own speedometer gear.  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 03/06/13 12:41 PM

HERE ARE SOME NUMBERS FOR YOUR MUNCIE.

CALCULATED          TRANS                       SPEEDO
RATIO                GEAR Teeth                  GEAR Teeth

4:10                 10                           41
4:11                 9                            37
4:20                 10                           42
4:22                 9                            38
4:30                 10                           43
4:50                 10                           45
4:56                 9                            41
4:62                 8                            37
4:78                 9                            43
4:88                 8                            39
4:89                 9                            44
5:00                 7                            35

Hope this helps..........

Bob  

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supersport66
V-6 Camaros rule!
Posts: 49
Joined: 01/08
Posted: 03/06/13 08:19 PM

National Parts Depot at npdlink.com has gears for the speedometer for $5.95 and a formula to figure out which one you need. I think Powerglide, Turbo 350 and Muncie 20 and 21 are the same gears. Grin  

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L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/07/13 04:15 PM

Thanks for the help. It looks like my only choices beside the 25 tooth I have or 27 and 32 tooth gears (I need more than 25 teeth) according to this website. Unless I can find an adapter that will work.

http://chevelleengineer.home.comcast.net/~chevelleengineer/speedo.htm  

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L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/07/13 04:21 PM

Thanks Bob. Those are numbers are for the ring an pinion ratios. It looks like my only other choices for the Muncie speedometer gears is 27 tooth and 32 tooth. I might end up going with an electronic speedometer that I can calibrate (if there is such a thing).  

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pepsi1
I mow my lawn and find Chevys
Posts: 1718
Joined: 09/11
Posted: 03/08/13 07:29 AM

L79lover

There is 3 different colums.

1.The first rear gear ratio.

2.The gear needed for your trans

3.Speedometer gear

4.That should correct your speedo. For your rear gear ratio. Sometime it's hard to get the colums to line up. I spent some time on it and thats the best it is. You have to remember your speedometer reading is directly related to the rear tire height....The taller the tire the more ratio you lose, and your speedo will be off that much. The shorter your tire it goes the opposite way.....Not much more we can do for you. Go to the website that TUFFNUFF has for you...

Bob  

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L79lover
I love my Chevy Chevette!
Posts: 17
Joined: 04/12
Posted: 03/08/13 05:22 PM

Bob,
Thanks again but column 3 is the number of teeth on the ring gear. The speedometer gear for a 4.10 diff (which I have) has 25 teeth. When I go to a 4.56 or lower (higher numerically) I need more teeth on the speedometer gear to slow the speedometer. If I go to a tall enough tire the 25 tooh gear may be close enough. I looked at all the suggested websites and others.

Victor  

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