speedometer problem

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thomasphilbeck
Posts: 10
Joined: July 17, 2006, 7:01 pm
Location: houston,tx

speedometer problem

Post by thomasphilbeck »

The rearend in my truck is a newer 9'' 28 spline geared to 3.25. I have no idea what was in it before. I need to figure out if i can adjust the speedometer for it or i just have to get a new one.
willy3486
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Joined: July 11, 2006, 10:31 am
Location: Smithville TN

Post by willy3486 »

Correct me if I am wrong members but when you do this can't you just swap out the plastic gear on the end of the speedo cable? Theres a plastic gear on the end that goes into the tranny and you can swap it out for one that has different number of teeth. I got to figure that out also as far as which one to get ,my rear end is different from original.
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FORDBOYpete
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Location: East Central Florida USA

Post by FORDBOYpete »

Yup. . . .it's called a speedometer driven gear & it's sold by ratio in rear.

ergo: Request a speedo driven gear for a 19' whatever year U have with a 3.25:1 rear gear. . . .then install it. :wink:

FBp 8)
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Broncotom
Posts: 92
Joined: July 17, 2006, 3:18 pm
Location: Pearland Texas
United States of America

Post by Broncotom »

Thomas, I have several plastic gears laying around. The twist on the gears are differant between a top loader which is what I have, and the automatics/three speeds ( I think ). What transmission do you have?
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Comet
Posts: 775
Joined: July 5, 2006, 10:03 pm
Location: Charleston, SC

Post by Comet »

There are charts on line to figure out what speedo gear you need after changing gears. They are stated in no. of teeth, so the part no. would be T-17 for 17 teeth, for example.
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ICEMAN6166
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Post by ICEMAN6166 »

i have the nylon gear i saved from a 3.25 truck.i will see if i can find it.i think its still attached to the cable too.
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William-in-St. George
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Joined: July 18, 2006, 3:55 pm
Location: Saint George, Utah

Speedometer Adjustment

Post by William-in-St. George »

I recently installed a new C6 in my old bug. Speedo is off by 10mph. It really felt like it was off but to be sure I checked by driving by one of those roadside speed reminders. I was at 30mph and the sign said 41. I had a 17 tooth gear in there so I tried a 20 tooth and its off more now. I will try gears with fewer teeth until I get closer. Any one have a 14 or so tooth gear to swap?
When you have 90% of what you want, think twice about insisting on the other 10%! Thomas Sowell
thomasphilbeck
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Joined: July 17, 2006, 7:01 pm
Location: houston,tx

Post by thomasphilbeck »

thanks for all the info guys i will check into it. I have a C6 behind a 302 and the orginal speedometer.


Also my compliments to all the members on here everyone is a huge help!
This has to be the best forum ive ever been apart of.

-Thomas
65' cc 302 w/C-6
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Comet
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Location: Charleston, SC

Post by Comet »

William, like I said above there are many charts on line to help you find the right gear. Work smarter not harder! :lol: Here are a couple examples:
http://www.sccoa.com/faq/speedgr.html

http://www.mattsoldcars.com/techinfo/gearteeth.shtml

Oh, and I forgot about the color coding on the gears. I think they're all like that, not sure though.
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Comet
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Location: Charleston, SC

Post by Comet »

Here's another. Disregard the fact that it's a Chevelle site:
http://www.chevelles.com/shop/speedo.html
My Slick is rustier than your Slick! :D
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