TheAMCForum.com Homepage
Forum Home Forum Home > The Garage > Transmission & Drivetrain
  New Posts New Posts RSS Feed - speedometer drive gear
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Click for TheAMCForum Rules / Click for PDF version of Forum Rules
Your donations help keep this valuable resource free and growing. Thank you.

speedometer drive gear

 Post Reply Post Reply Page  12>
Author
Message Reverse Sort Order
Teamamc View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/04/2007
Location: Canada
Status: Offline
Points: 1055
Post Options Post Options   Thanks (0) Thanks(0)   Quote Teamamc Quote  Post ReplyReply Direct Link To This Post Topic: speedometer drive gear
    Posted: Apr/27/2015 at 9:55pm
No one ever found a speedo drive gear vendor??
Back to Top
poormansMACHINE View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jun/28/2007
Location: Shoemaker-Levy9
Status: Offline
Points: 12302
Post Options Post Options   Thanks (0) Thanks(0)   Quote poormansMACHINE Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 11:11pm
Back to Top
amx39068 View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar

Joined: Feb/21/2008
Location: Arizona
Status: Offline
Points: 11576
Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 10:09pm
Originally posted by poormansMACHINE poormansMACHINE wrote:

Hopefully you're looking for the driven gear and not the drive.
Just takes a little web poking.
TCI auto
transmissionone
 
Looking for the one on the end of the speedo cable which is what those FRD ones look like
Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
Back to Top
poormansMACHINE View Drop Down
AMC Addicted
AMC Addicted
Avatar
Charter Member

Joined: Jun/28/2007
Location: Shoemaker-Levy9
Status: Offline
Points: 12302
Post Options Post Options   Thanks (0) Thanks(0)   Quote poormansMACHINE Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 9:26pm
Hopefully you're looking for the driven gear and not the drive.
Just takes a little web poking.
TCI auto
transmissionone
Back to Top
amx39068 View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar

Joined: Feb/21/2008
Location: Arizona
Status: Offline
Points: 11576
Post Options Post Options   Thanks (0) Thanks(0)   Quote amx39068 Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 9:21pm
Excellent!  I need a couple of black ones so that link is a big help!
Dan Curtis-Owner and CEO AZ AMC Restorations; Facebook: https://www.facebook.com/amcmusclecars/ & Curtis Real Estate Development
Back to Top
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Offline
Points: 5905
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 11:59am
Link to a Ford Speedometer gear info web page, not sure if it's any help or not,
but may be if the Borg Warner's use Ford style speedometer gears
which should be available from your local Ford dealership.
 
Back to Top
tufcj View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum
Avatar
Supporter of TheAMCForum

Joined: Jul/10/2007
Location: Watkins, CO
Status: Offline
Points: 4066
Post Options Post Options   Thanks (0) Thanks(0)   Quote tufcj Quote  Post ReplyReply Direct Link To This Post Posted: Jan/09/2009 at 9:29am
Originally posted by whizkidder whizkidder wrote:

 
Bob:  Are you sure?  Seems like an 8 or 9 tooth trans gear would spin your cable even faster, and push your indicated speed even higher.  I'd think you'd need less teeth on the trans gear...
 


I haven't looked inside the tranny.  I knew it would be off from my years of gear/tire size changes in 4x4s.  But you are right, I probably have a 9 tooth gear, and need a 7 or 8, I was thinking backwards (which happens more often as I age). Wink

Bob
tufcj
69 AMX
74 Javelin AMX
67 Rogue

If you need a tool and don't buy it...
you'll eventually pay for it...
and not have it.
Henry Ford
Back to Top
PHAT69AMX View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/07/2007
Location: West Virginia
Status: Offline
Points: 5905
Post Options Post Options   Thanks (0) Thanks(0)   Quote PHAT69AMX Quote  Post ReplyReply Direct Link To This Post Posted: Jan/08/2009 at 6:24pm
Understanding is if a speedometer is off, it is off by a percentage, the faster one goes, the farther it is off.  For example if off by 10%, would be off by 1 MPH at 10mph, off by 10 MPH at 100mph.  It does give the "target' Revs Per Mile in the TSM doesn't it ?  Oh, ok, just looked, it gives the Revs Per Mile for the TIRE, not the speedometer cable.  Have in my head from somewhere the speedometer cable should spin 1000 revs per mile, but that might be incorrect.  Guess I could do some math based on the TSM info.  About 1000 Revs Per Mile for the Speedometer cable is what I get using the info in the TSM.  Your mileage may vary Wink
Back to Top
mramc View Drop Down
AMC Addicted
AMC Addicted
Avatar

Joined: Jul/12/2007
Location: United States
Status: Offline
Points: 3217
Post Options Post Options   Thanks (0) Thanks(0)   Quote mramc Quote  Post ReplyReply Direct Link To This Post Posted: Jan/08/2009 at 5:00pm
I have a similar problem as my 69 AMX has a 727 type transmission in it and I've found the speedometer is reading some thing like 15 MPH low. So, I did a lot of research on the internet and found the out fit with the web address below and saved it for future reference. I have not contacted them yet , but they seem to pretty much be "Speedometer Gears R' US" If don't have it I don't think any one else will. They have a very extensive list of speedometer gears. LRDaum
http://www.transmissioncenter.net/speedometer_calibration_______va.htm
LRDaum
Back to Top
whizkidder View Drop Down
Supporter of TheAMCForum
Supporter of TheAMCForum


Joined: Mar/03/2008
Location: North Georgia
Status: Offline
Points: 2972
Post Options Post Options   Thanks (0) Thanks(0)   Quote whizkidder Quote  Post ReplyReply Direct Link To This Post Posted: Jan/08/2009 at 4:25pm
Originally posted by tufcj tufcj wrote:

My problem was that my AMX came with 3.15 gears and a 23 tooth driven gear (the biggest).  When I went to 3.73s, my speedo read almost 20 MPH high.  Since I have the biggest driven gear, the only option will be to replace the drive gear.  I assume I have a 7 tooth, and need an 8 or 9 (which would have to come from a used tranny).
 
Bob:  Are you sure?  Seems like an 8 or 9 tooth trans gear would spin your cable even faster, and push your indicated speed even higher.  I'd think you'd need less teeth on the trans gear...
 
at 800 tire revs/mile, and 1000 rpm cable speed @ 60mph indicated, 3.15 gears would require:
 
7/17.6 (18 tooth cable gear)
8/20.16 (20 tooth cable gear)
9/22.68 (23 tooth cable gear)
 
Swap to 3.73 gears:
 
7/20.888 (21 tooth)
8/23.872 (24 tooth not avaliable?)
9/26.856 (27 tooth not available?)
 
If your speedo was close to correct with your 3.15 gears, I'd guess you had a 9 tooth/23 tooth combo, and now need an 8/23 combo to get close.


Edited by whizkidder - Jan/08/2009 at 4:42pm
Ron Frost
marne1ancient @ gmail.com
910 nine two two 0563

"There is no limit to what a man can do, so long as he does not care a straw who gets credit for it. Charles Montague
Back to Top
 Post Reply Post Reply Page  12>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.03
Copyright ©2001-2019 Web Wiz Ltd.

This page was generated in 0.188 seconds.
All content of this site Copyright © 2018 TheAMCForum unless otherwise noted, all rights reserved.
PROBLEMS LOGGING IN or REGISTERING:
If you have problems logging in or registering, then please contact a Moderator or