speedo - Off-Road Forums & Discussion Groups
GM Standard SFA Trucks & SUV's All discussion of full sized Solid Front Axle Trucks, SUV's to include Suburban

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 05-08-2002, 09:51 PM
**DONOTDELETE**
Guest
 
Posts: n/a
speedo

I have no speedo...no...not the swimsuit, but the indicator. I was off about 10 mph when it did work and want to change the gear reducer anyhow, even if that doesn't fix it (might be a gear in the t-case). My ordeal now is that the local chevy dealer has no idea how to find out which unit to use. I was showing to go about 50 when running 60mph or so. I am running a 350 th trans, 3.73 gears and 31/10.5/15 tires. Isn't there a method of calculating this? The gear reducer on my truck is 1: .866 which is discontinued anyway. I need to make the speedo see me going about 10mph faster at highway speed. Which number needs to change? The (1) or the (.866) is my question I guess. This is on my 69 gmc with 75 axles. Hope someone has an idea, I may get a ticket guessing my speed all the time!
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 05-08-2002, 10:22 PM
Carpal \'Tunnel
 
wrath's Avatar
 
Join Date: Nov 2001
Location: Waukesha, WI
Posts: 3,323
Thanks: 0
Thanked 1 Time in 1 Post
 
Re: speedo

Check the cable(s). If you've got cruise control it's mechanical and you'll have a box under the hood somewhere.

As far as changing the pickup gear in the transmission or transfer case, I don't know.

I've never had a vehicle that had the speedometer correct. My Sonoma was going 70 when the speedo showed 59. It's not a big deal as long as you remember that it's off.
wrath is offline  
post #3 of (permalink) Old 05-08-2002, 10:58 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: speedo

I really need to change out the reducer, and want to know how to correct the thing. I definitely don't have cruise on a 69 gmc! Cable is good, and reducer has to change as it is leaking and won't seal properly, may fall apart any moment. Just want to try and get the right one while ordering one. 55 bucks and want to get it right the first time!
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 05-10-2002, 03:37 PM
**DONOTDELETE**
Guest
 
Posts: n/a
Re: speedo

Here is a site with a chart on it for GM speedo gears
http://www.novaresource.org/speedo.htm
Hope that helps
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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 for yourself.

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 not 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