Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Stock differential replacement

Thread Tools
 
Search this Thread
 
Old Apr 18, 2013 | 01:41 PM
  #1  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Stock differential replacement

I have an open 3.08 rear. Want 3.55 and a limited slip. What spline are the factory axles and are these c clip style rears like the mustang? Just wondering what vehicles I can pull a diff out of and make work.
 
Reply
Old Apr 18, 2013 | 01:54 PM
  #2  
SideWinder4.9l's Avatar
SideWinder4.9l
FTE Chapter Leader
15 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: May 2009
Posts: 8,843
Likes: 27
From: Eastern Ky
Club FTE Silver Member

IIRC, the axles are 30-31 splines (31 I'm pretty sure of)..

And yes they have the C-Clips (8.8's are the same, except spline count, etc..)
 
Reply
Old Apr 18, 2013 | 06:11 PM
  #3  
Conanski's Avatar
Conanski
FTE Legend
15 Year Member
Photogenic
Photoriffic
Community Builder
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
 
Reply
Old Apr 18, 2013 | 07:27 PM
  #4  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Originally Posted by Conanski
You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
Thanks for the tip. Figured it would be easier to find a full rear than it would be to swap out the gears. Do I have to find one off a rwd truck or can I use one off a 4x4?
 
Reply
Old Apr 18, 2013 | 07:29 PM
  #5  
BlackHD06's Avatar
BlackHD06
Freshman User
Joined: May 2011
Posts: 42
Likes: 0
From: Houston
v8 ford explorer w/ 8.8 from 97-2000ish. will have the same carrier etc if you're just looking for cheap gears. then you can grab the ratech tool and install them on the driveway. look on the tag before you open them, it will specify posi and gear ratio
 
Reply
Old Apr 18, 2013 | 08:21 PM
  #6  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Originally Posted by BlackHD06
v8 ford explorer w/ 8.8 from 97-2000ish. will have the same carrier etc if you're just looking for cheap gears. then you can grab the ratech tool and install them on the driveway. look on the tag before you open them, it will specify posi and gear ratio
That's what I was thinking about doing. Wanted to go to a 3.55 limited slip as cheap as possible.
 
Reply
Old Apr 18, 2013 | 09:18 PM
  #7  
Conanski's Avatar
Conanski
FTE Legend
15 Year Member
Photogenic
Photoriffic
Community Builder
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Originally Posted by Jarryd
Do I have to find one off a rwd truck or can I use one off a 4x4?
Same rear axle in all F-series of this vintage.
 
Reply
Old Apr 19, 2013 | 01:13 AM
  #8  
SideWinder4.9l's Avatar
SideWinder4.9l
FTE Chapter Leader
15 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: May 2009
Posts: 8,843
Likes: 27
From: Eastern Ky
Club FTE Silver Member

Originally Posted by Conanski
You will need a truck axle those in cars are only 27 spline, but 3.55 gears were extremely common in trucks so you should not have much trouble finding a complete axle to swap in.. which will save you the cost of re-alligning the gearset. If the one you get has unknown miles new axle bearings and seals are a good idea of course, and look for axle code H5 on the drivers door pillar to get the factory limited slip.
Ummm..

Isn't the codes-

Open Differential | Limited Slip
18=3.08 H8=3.08 LSD
19=3.55 H9=3.55 LSD

?

Because I pulled the 3.55 LSD setup I have to go in my truck, from a 1990 F-150 with a H9 door code.


Just makin' sure here.
 
Reply
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Apr 19, 2013 | 07:04 AM
  #9  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Originally Posted by SideWinder4.9l
Ummm..

Isn't the codes-

Open Differential | Limited Slip
18=3.08 H8=3.08 LSD
19=3.55 H9=3.55 LSD

?

Because I pulled the 3.55 LSD setup I have to go in my truck, from a 1990 F-150 with a H9 door code.


Just makin' sure here.
Isn't there a code on the axle itself?
 
Reply
Old Apr 19, 2013 | 11:23 PM
  #10  
SideWinder4.9l's Avatar
SideWinder4.9l
FTE Chapter Leader
15 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: May 2009
Posts: 8,843
Likes: 27
From: Eastern Ky
Club FTE Silver Member

Originally Posted by Jarryd
Isn't there a code on the axle itself?
If the tag is still there then yes..

It'll say 3 55 or 3 L55, etc...

And if the carrier is out, etc... The gear its' self has the ratio stamped into it, IIRC
 
Reply
Old Apr 19, 2013 | 11:29 PM
  #11  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Are both of those limited slip?
 
Reply
Old Apr 19, 2013 | 11:36 PM
  #12  
SideWinder4.9l's Avatar
SideWinder4.9l
FTE Chapter Leader
15 Year Member
Photogenic
Photoriffic
Shutterbug
Joined: May 2009
Posts: 8,843
Likes: 27
From: Eastern Ky
Club FTE Silver Member

Originally Posted by Jarryd
Are both of those limited slip?
No...

3 55 is open differential
3 L55 is Limited Slip
 
Reply
Old Apr 19, 2013 | 11:39 PM
  #13  
Jarryd's Avatar
Jarryd
Thread Starter
|
Posting Guru
Joined: Mar 2013
Posts: 1,726
Likes: 3
Figured that was the case. I want a limited slip.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
trekalltop
1983 - 2012 Ranger & B-Series
1
Feb 12, 2015 07:51 PM
dixie460
1987 - 1996 F150 & Larger F-Series Trucks
19
Dec 6, 2014 09:32 PM
jdrahush
1997 - 2003 F150
7
Aug 7, 2008 06:25 AM
bbtkd
Ranchero & 1961 - 1967 Econoline
5
Aug 30, 2004 09:36 AM




All times are GMT -5. The time now is 04:37 PM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE