Gear question for the speedometer - Team Camaro Tech
Tech 2000 Our previous General Forum
Replies ONLY - no new topics.

 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old Mar 26th, 01, 06:37 AM Thread Starter
Senior Tech
 
Join Date: Feb 2001
Location: san jose, ca
Posts: 209
Question

I did a search on the speedo calibration and most of the topics assume the speedo was working. I recently bought my 69 camaro and it originally came with a small block and auto transmission. The previous owner swapped in a big block and T-10 transmission. When I bought the car, the speedo was not working. I bought a new cable and hooked it to the speedo and it seems to be working, so I checked the tranny end and found the teeth on the driven gear are stripped. So now the question. I have a 4.10 rear end with 27.5 inch tires. The T-10 transmission currently has a white drive gear. What is the correct driven gear? Sorry for the long build up prior to the question.

thanks
Dean
bilydean is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old Mar 26th, 01, 07:32 AM
Gold Lifetime Member
Robert
 
Join Date: Oct 2000
Location: Simpsonville, SC
Posts: 3,358
Post

You may have to count the teeth on the white drive gear then go to the following site, use the formula and you should be set. Keep in mind that your white drive gear may not be the correct one for your current setup. http://www.chevelles.com/shop/speedo.html


------------------
Robert

'69 getting better every day... (every pay day)
rojo is offline  
post #3 of 10 (permalink) Old Mar 26th, 01, 07:32 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,623
Garage
Cool

If memory serves me correctly, 4.10 and above ratios had a reducing gear box attached to the ext housing and then speedo cable hooked up to it.

I need one but haven't found any. The gear needed for our ratio would be too large to fit into hole of ext housing.

If you find one, let me know.

Everett 68/350/PG/11.90/115mph
Everett#2390 is offline  
 
post #4 of 10 (permalink) Old Mar 26th, 01, 08:37 AM Thread Starter
Senior Tech
 
Join Date: Feb 2001
Location: san jose, ca
Posts: 209
Talking

Robert, I was looking at Ricks First generation catalog and they show the white driving gear, but they do not say how many teeth it has. Since the tranny is still in the car, it is a bit difficult to count the teeth. Any idea on the number of teeth? I checked the site you suggested. Definitly some good info.
bilydean is offline  
post #5 of 10 (permalink) Old Mar 26th, 01, 08:39 AM Thread Starter
Senior Tech
 
Join Date: Feb 2001
Location: san jose, ca
Posts: 209
Post

Everett, Where did you hear that we needed a reducing gear box? Not questoning that we need it, just curious of the source. Thanks for the help so far.

bilydean is offline  
post #6 of 10 (permalink) Old Mar 26th, 01, 09:10 AM
Gold Lifetime Member
Robert
 
Join Date: Oct 2000
Location: Simpsonville, SC
Posts: 3,358
Post

bilydean

Sorry I don't know the answer. I bet someone on this site does though, if they happen to see this post. I was able to count the teeth on my automatic by pulling out the driven gear housing, jacked up the rear, with a flash light in hand I marked the first tooth then had my wife slowly turn the rear wheel as I counted. Counted about three times to make sure.

------------------
Robert

'69 getting better every day... (every pay day)
rojo is offline  
post #7 of 10 (permalink) Old Mar 26th, 01, 09:27 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,623
Garage
Cool

From the GM Parts man himself, He suggested GM put them on by application.

He also said hasn't seen much activity for them either, But he did know what I was talking about and remembered them from the Wayback Machine

Everett 68/350/PG/11.90/115mph
Everett#2390 is offline  
post #8 of 10 (permalink) Old Apr 17th, 01, 05:57 AM Thread Starter
Senior Tech
 
Join Date: Feb 2001
Location: san jose, ca
Posts: 209
Talking

Well, I finally have the solution and my speedometer is working and actually reading correct. I put in a 24 tooth driven gear and that was about as big as I could fit in and that still wasn't correct. What I finally ended up with was a 22 tooth driven gear and then used the adapter, part number 3932220, which is a gear reduction of 1:0.75.
This equates to roughly adding 5 teeth to the driven gear. Everett, you were right.

thanks
Dean
bilydean is offline  
post #9 of 10 (permalink) Old Apr 17th, 01, 07:28 AM
Super Moderator
Bess-68's rule
 
Everett#2390's Avatar
 
Join Date: Sep 2000
Location: Va Beach VA
Posts: 31,623
Garage
Cool

Thanks, Dean for the P/N of the reducing box.

I knew my memory wasn't that far off. I called my GM parts man to check on pricing, $30 each.

Everett 68/350/PG/11.90/115mph
Everett#2390 is offline  
post #10 of 10 (permalink) Old Apr 17th, 01, 11:46 AM Thread Starter
Senior Tech
 
Join Date: Feb 2001
Location: san jose, ca
Posts: 209
Post

Everett, just so you know, this is a straight adapter, not a 90 degree.

Dean
bilydean is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome