Is it expensive/tough to change speedo gear? - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 03-01-2004, 08:52 PM Thread Starter
 
Join Date: Oct 2001
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
 
Is it expensive/tough to change speedo gear?

I have an '81 Scrambler with a Dana 300. The speedo is 15 mph fast and I'm wondering how easy it is to change the gear in the transfer case. Also, where do you get replacement speedo gears?
kansasjeeper is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 03-01-2004, 10:13 PM
Official Historian
 
WILL's Avatar
 
Join Date: Sep 1999
Location: Hot Springs, AR
Posts: 8,339
Thanks: 1
Thanked 5 Times in 5 Posts
 
Re: Is it expensive/tough to change speedo gear?

15 mph fast at what speed? It will be off a percentage so the absolute difference will change with speed.
WILL is offline  
post #3 of (permalink) Old 03-02-2004, 06:58 AM
Keyboard Implanted
 
Join Date: Aug 2001
Location: Vermont
Posts: 2,348
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Is it expensive/tough to change speedo gear?

No it is not hard to change the speed so it will read correctly.
On the D300 you take off the speedo housing on the Xcase and replace the gear inside. The best place to find the gears is at a Jeep dealership, and they are pretty cheap. I think one can be had for about $15.
While you have everything apart, pull out your speedo cable and lube it up. Good luck.
Olin18 is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 03-02-2004, 08:44 PM Thread Starter
 
Join Date: Oct 2001
Posts: 110
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Is it expensive/tough to change speedo gear?

It's 15 mph off @ 65 true mph. I used my WAAS enables GPS (accuracy of 10 feet) to get my true speed on a flat highway and at 65 mph my speedo shows 80.
kansasjeeper is offline  
post #5 of (permalink) Old 03-02-2004, 10:13 PM
Official Historian
 
WILL's Avatar
 
Join Date: Sep 1999
Location: Hot Springs, AR
Posts: 8,339
Thanks: 1
Thanked 5 Times in 5 Posts
 
Re: Is it expensive/tough to change speedo gear?

So it is reading 23% fast. You need a drive gear with ~23% more teeth to slow it down.
WILL is offline  
post #6 of (permalink) Old 03-03-2004, 10:22 AM
I Might Just Know What I'm Talking About
 
Raduckal's Avatar
 
Join Date: Sep 1999
Location: Owensboro, KY
Posts: 1,905
Thanks: 3
Thanked 4 Times in 4 Posts
 
Re: Is it expensive/tough to change speedo gear?

Will's right.
This calculator and info may help too.
Raduckal is offline  
post #7 of (permalink) Old 03-03-2004, 11:32 PM
AuburnU_91YJ
Guest
 
Posts: n/a
Re: Is it expensive/tough to change speedo gear?

I have the same problem on my 91 YJ. I believe it is because the stock differentials (3.07) have been replced with 4.11's. The speedometer reading needs to be taken down by 25% to get the actual speed, and 3.07/4.11 = .75

Anyway, thanks for re-posting the speedo calculator.

Does anyone know how to change the speedo on a 91 YJ?
post #8 of (permalink) Old 03-04-2004, 12:57 AM
Keyboard Implanted
 
lomodyj's Avatar
 
Join Date: Jan 2002
Location: Chapel Hill, NC
Posts: 3,761
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Is it expensive/tough to change speedo gear?

Find the cable coming into the Tcase (on the drivers side) un screw it and pull.
lomodyj is offline  
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