First year 31 spline trucks??? Help
Thread Starter
|
New User
Joined: Mar 2002
Posts: 9
Likes: 0
From: cockeysville usa
First year 31 spline trucks??? Help
Hoping you guys can clear this up. What year did Ford begin putting the 31 splines in trucks? There is all kinds of conflicting info. Specifically, I'm looking a F-100s. I've been told that 31 splines began in 74. Been told by another it was 72. So what was the deal? What trucks had 31 splines? Was it a matter of options? I'm so confused and no one seems to truely know. I need help from Ford truck experts.
Junior User
Joined: Dec 2001
Posts: 84
Likes: 0
From: Burnaby BC, Canada
First year 31 spline trucks??? Help
I've got a '72 F-100 4x4,it has 31 splines. Original rear end. I know this doesn't answer the question but at least you know that they had them in '72.
Don W
Don W
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
First year 31 spline trucks??? Help
We recently parted out a 73 that had a 31 spline. Did a 78 a month earlier that had 28. 
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
Mountain Pass
Joined: Dec 2000
Posts: 200
Likes: 0
From: eudora ks
First year 31 spline trucks??? Help
the trac-loc was an option available in 1970. on the 70 xlt that i robbed the option cost $107. it was available at 3.25,3.50,3.70, & 4.11 ratios. incidentally the 9 inch in a f100 is actually a 9 3/8 inch rearend and won't fit the 9 inch housing without some modification and is a 31 spline rearend. incidentally neither of mine are n-case rears although i have heard that some were. prior to that i don't know if they are 28 or 31 spline as i don't have any dealer's invoices or a dealership's brochure. my guess is that all traction loc rears were 31 spline from 67 to 72.
5th Wheeling
Joined: Sep 2002
Posts: 35
Likes: 1
From: Western Canada
First year 31 spline trucks??? Help
[updated:LAST EDITED ON 14-Sep-02 AT 05:56 PM (EST)]Just started parting out a '69. Suspected it was a trak lok & removing the "pumpkin" only confirmed that it was. Also 3.70 gears, 31 spline axles and the best surprise; a 4 pinion diff. All original to the truck. Hope this helps.
Trending Topics
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
First year 31 spline trucks??? Help
New guys rummaging in the old files again. 
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member 0004 since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
http://www.clubfte.com/users/jowilker/USFlag.gif
John
jowilker email me
[link:www.ford-trucks.com/users/jowilker|My Club FTE Page] Member 0004 since 01 01
[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NCFTO] North Carolina Ford Truck Owners Group
In the cool still quiet of night, you can hear chevies rusting away.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Senior User
Joined: Jan 2002
Posts: 143
Likes: 0
From: Munford Tn
First year 31 spline trucks??? Help
I just pulled the chunk out of my 70 F100 XLT and it has the original 3.25 4 pinion 28 spline locker in it, Im sure it is a 9in not a 9 3/8, how can you tell the difference I have a few 9" centers laying around to compare.
Thread
Thread Starter
Forum
Replies
Last Post
Turbo Dog
1967 - 1972 F-100 & Larger F-Series Trucks
35
Nov 17, 2014 05:24 AM
71Ranger97
1967 - 1972 F-100 & Larger F-Series Trucks
3
May 1, 2014 08:27 AM
AGATE
Clutch, Transmission, Differential, Axle & Transfer Case
4
May 16, 2004 03:10 AM
