Speedometer Adaapter - Ford Truck Enthusiasts Forums
 

Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks
Log In 


1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Speedometer Adaapter

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 12-24-2013, 08:28 PM
tpdaniels's Avatar
tpdaniels tpdaniels is offline
Senior User
 
Join Date: Dec 2003
Posts: 222
tpdaniels is starting off with a positive reputation.
Speedometer Adaapter

My speedometer has been WAY-OFF after switching from 4.10 to 3.54 gears in my F-250 4X4, I also went from a 29" high tire to a 34" high one, that just added to the problem. By my gps when the speedometer was on 50 my GPS was reading 64 MPH, that equals 28% slow. The speedometer runs off of the tail-shaft on the transfer case and I could not find a internal gear to fix this, I did find a gear ratio adapter that can correct, up or down any amount, you just have to order what you need. I got one to speed up my speedometer 28% for $70 dollars including shipping from (PATC - Speedometer World) and it works perfect, speedometer is now dead on right and I am a Happy Camper. Just passing this along if anyone else has this problem, if this adapter is not the one you need just look at their website, I'm almost sure you can find what you need.

Just for your information I have a C-6 automatic and before changes I was running 2683 RPM at 55 MPH, after switching to lower gears and taller tire it now runs 1976 RPM at 55. and the FE engine cruises just great in the 2000 RPM range.

Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4

Click the image to open in full size.
Reply With Quote
  #2  
Old 12-25-2013, 01:23 AM
RichS2659 RichS2659 is offline
Elder User
 
Join Date: Feb 2006
Location: North Pole, Alaska
Posts: 922
RichS2659 is starting off with a positive reputation.
Thanks for the information. One thing though is that your old 4.10 ratio is a lower gear (higher numerically), compared with your new 3.54 which is a higher gear.
Reply With Quote
  #3  
Old 12-26-2013, 09:41 AM
JEFFFAFA's Avatar
JEFFFAFA JEFFFAFA is offline
Post Fiend
 
Join Date: Mar 2013
Location: Phoenix, Az.
Posts: 7,537
JEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to beholdJEFFFAFA is a splendid one to behold
Quote:
Originally Posted by tpdaniels View Post
My speedometer has been WAY-OFF after switching from 4.10 to 3.54 gears in my F-250 4X4, I also went from a 29" high tire to a 34" high one, that just added to the problem. By my gps when the speedometer was on 50 my GPS was reading 64 MPH, that equals 28% slow. The speedometer runs off of the tail-shaft on the transfer case and I could not find a internal gear to fix this, I did find a gear ratio adapter that can correct, up or down any amount, you just have to order what you need. I got one to speed up my speedometer 28% for $70 dollars including shipping from (PATC - Speedometer World) and it works perfect, speedometer is now dead on right and I am a Happy Camper. Just passing this along if anyone else has this problem, if this adapter is not the one you need just look at their website, I'm almost sure you can find what you need.

Just for your information I have a C-6 automatic and before changes I was running 2683 RPM at 55 MPH, after switching to lower gears and taller tire it now runs 1976 RPM at 55. and the FE engine cruises just great in the 2000 RPM range.

Speedometer Gear, Speedometer Gears, Ford, GM, Dodge 700R4

Click the image to open in full size.
Good job TP for building this info thread. Now in the future any Guy or Gal who googles the same speedo problem will be able to see and find your solution. Cool!
__________________
KING (2) of the Bumpside Kingdom.
Trucks aren't Cool unless the tailgate handle swings..........
Never be afraid to try something new. Remember, amateurs built the ark, and professionals built the Titanic.
.









Reply With Quote
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
speedometer calibration kr514 1994.5 - 1997 7.3L Power Stroke Diesel 12 09-24-2015 10:22 AM
Speedometer and door lock problems 2003 Exp zaneroni Expedition & Navigator 6 01-05-2015 06:29 PM
hypertech speedometer calibrator review jlmotox Super Duty & Heavy Duty 0 07-26-2014 05:17 PM
LMC Trucklife Feature Story tpdaniels 1967 - 1972 F-100 & Larger F-Series Trucks 7 05-02-2014 07:30 PM
Speedometer not accurate bduemig Pre-Power Stroke Diesel (7.3L IDI & 6.9L) 4 05-01-2014 09:47 PM


Go Back   Ford Truck Enthusiasts Forums > Older, Classic & Antique Trucks > 1967 - 1972 F-100 & Larger F-Series Trucks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump



All times are GMT -5. The time now is 01:13 PM.

 

Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup