Limited slip 9"
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
The 9 inch clutch type limited slip was introduced in 1959. Besides the usual rear end tag..there is a separate tag with just the letter L on it. Yes, I know chances are slim that tag might still be on a rear end...but I thought I might as well pass the info along regardless.
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Originally Posted by RTM
I have never seen nor heard of a 3.54 9 inch ratio. I guees that doesn't mean there isn't one but I have been around some older guys that have taught me the things I know so I kind of rely on them and the net for my info.
Post Fiend
Joined: Jun 2002
Posts: 13,873
Likes: 3
From: Atlanta GA
> There is no such thing as a 3.54 for a 9 inch axle.
I should have said 3.55, which is what it could have come with from the factory with the 3.54 Dana 44 front axle. Which I have owned in old 4x4 Ford trucks.
I should have said 3.55, which is what it could have come with from the factory with the 3.54 Dana 44 front axle. Which I have owned in old 4x4 Ford trucks.
New User
Joined: Oct 2006
Posts: 13
Likes: 0
3.56
Ford used a 3.555555, which they rounded up to the 3.56 in the late 50's;
You will find these typically in WAR, WAA, or WAB cases during the days
when the tags were simply numbers. The tag would only read "356".
You will find these typically in WAR, WAA, or WAB cases during the days
when the tags were simply numbers. The tag would only read "356".
Senior User
Joined: Oct 2001
Posts: 268
Likes: 0
From: North Texas
Originally Posted by rebocardo
Correct me if I am wrong, the 3.50 9" came in the 80s (ex: full sized broncos). A 1979 truck would have the 3.54.
And any of the trucks he listed in his signature line would have come with 31-spline axles.
Basically, E-100/150 vans came with 28-spline axles, pickups and all 4x4s (full-size at least) had 31-splines.
Last edited by Redbob; Dec 21, 2006 at 12:29 AM.
Elder User
Joined: Jul 2004
Posts: 811
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I still have an extra third member from my 85 Bronco 9" LS. Its 31 spline but I'm confused about the ratio. In the 80's I thought they called it a 3.55, but now I see replacements are 3.50 ...Guess it's a 3.50
http://broncograveyard.com/bronco/c-...rd_members.htm
http://broncograveyard.com/bronco/c-...rd_members.htm
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Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
Originally Posted by Netfly
I still have an extra third member from my 85 Bronco 9" LS. Its 31 spline but I'm confused about the ratio. In the 80's I thought they called it a 3.55, but now I see replacements are 3.50 ...Guess it's a 3.50
http://broncograveyard.com/bronco/c-...rd_members.htm
http://broncograveyard.com/bronco/c-...rd_members.htm
If your Bronco has a 9", then it most likely has 3.50 gears - in the rear at least. If it has an 8.8" axle, then it probably has 3.55 gears. Front axle ratios are different, obviously. They are rarely an exact match from the factory.
Senior User
Joined: Oct 2001
Posts: 268
Likes: 0
From: North Texas
And you can always tell the ratio with a little math:
if it's out of the truck, divide the number of teeth on the pinion gear into the number of teeth on the ring gear.
If it's in the truck, jack up one wheel, put a visible mark on the driveshaft, and with the trans (or transfer case) in neutral, rotate the one wheel two complete revolutions.
The number of times the driveshaft turns is your ratio.
if it's out of the truck, divide the number of teeth on the pinion gear into the number of teeth on the ring gear.
If it's in the truck, jack up one wheel, put a visible mark on the driveshaft, and with the trans (or transfer case) in neutral, rotate the one wheel two complete revolutions.
The number of times the driveshaft turns is your ratio.
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