|
|
|
06-23-2010, 05:12 AM
|
#1 |
|
Registered User
 
Join Date: Nov 2009
Location: Youngstown, OH
Posts: 15
|
Speedo is 10mph off.
For example, when the speedo shows 20mph, I'm actually going 30.
Has been this way since I bought it. Can anyone tell me how to go about fixing it? |
|
|
|
06-23-2010, 06:08 AM
|
#2 | |
|
Chemist under the hood...
Join Date: Apr 2009
Location: Fort Erie,ON, Canada
Posts: 617
|
Re: Speedo is 10mph off.
Quote:
http://chevelleengineer.home.comcast...eer/speedo.htm
__________________
Current fleet: 2013 GMC Sierra, 5.3L, 4x4 1988 GMC Sierra, 305, Auto 1984 Jeep Grand Wagoneer, 360 V8 1997 VW Cabrio, 2.0L 2017 Toyota Rav4, 2.5L Stuff I wish I still had: 2013 Toyota Matrix [RIP] 1967 GMC 910 Fleetside, 283 V8 [1st Love-SOLD] 1987 Jeep Cherokee Laredo 4X4, 4.0 I-6 [SOLD} 1994 Chevrolet Caprice Classic, 5.7LV8 [SOLD] 1995 Chevrolet Astro AWD, 4.3L V6 (RIP) 1998 Chevrolet Suburban 4x4, 5.7L V8 [SOLD] |
|
|
|
|
|
06-23-2010, 07:43 AM
|
#3 |
|
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
|
Re: Speedo is 10mph off.
I have the same issue and hes correct...I went from 308 gears to 373, Its not hart to swap the gear you just need to pull the tail shaft housing off the trans..you dont loose hardly any fluid..maybe 1/2 pint took me about an hour
|
|
|
|
|
06-23-2010, 09:38 AM
|
#4 |
|
Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
|
Re: Speedo is 10mph off.
On some automatics it's easy enough to remove the tail shaft housing as mentioned but in a standard transmission it's not as easy to remove the tailshaft. At least it wasn't on my saginaw 3 speed manual.
On mine, I was actually going slower than what was showing on the speedometer so I got a driven gear with fewer teeth to increase the speedometer speed. I did not have to change the drive gear inside the tailshaft. And, I got mine at the chevy dealer for around $7. Here's some other sites. http://www.73-87.com/7387garage/drivetrain/speedo.htm On this site scroll down to find you transmission. http://www.transmissioncenter.org/GM...eter_Gears.htm |
|
|
|
|
06-23-2010, 07:31 PM
|
#5 | |
|
Registered User
Join Date: May 2010
Location: Wallingford, PA
Posts: 186
|
Re: Speedo is 10mph off.
Quote:
|
|
|
|
|
|
06-23-2010, 12:47 PM
|
#6 |
|
Registered User
Join Date: Nov 2009
Location: Youngstown, OH
Posts: 15
|
Re: Speedo is 10mph off.
Thanks guys. Man, this forum is really worth its weight in gold.
-er... wait..... It has no weight! Lets just say its fantastic! Last edited by Chopper9; 06-23-2010 at 12:48 PM. |
|
|
|
|
06-23-2010, 01:58 PM
|
#7 |
|
Cruzin
Join Date: Dec 2009
Location: on the road
Posts: 2,835
|
Re: Speedo is 10mph off.
here is some more infohttp://67-72chevytrucks.com/vboard/s...d.php?t=345091
__________________
Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14
|
|
|
|
|
06-23-2010, 05:47 PM
|
#8 |
|
"Hooked on Quack"
Join Date: Apr 2010
Location: Midlothian,TX
Posts: 154
|
Re: Speedo is 10mph off.
great info saved to favorites as this will be a modification I have to do since I now have 37" tires. My only concern is having to change the drive gear because A. I have a manual transmission and B. I would have to remove the Transfer case to get to the gear which would suck.
__________________
Semper Fi, Kevin  USMC
|
|
|
|
|
06-23-2010, 08:11 PM
|
#9 |
|
Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
|
Re: Speedo is 10mph off.
Try one of these. Unscrew your speedo cable. Screw on the adaptor. Hook your speedo up to the adaptor.http://cgi.ebay.com/ebaymotors/Gear-...Q5fAccessories
|
|
|
|
 |
| Bookmarks |
|
|
Hybrid Mode
