Rear Axel ID
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New User
Joined: May 2017
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From: Phoenix, AZ.
Rear Axel ID
VIN plate says this is a 3.92 gear ratio, it's out of a 1954 Ford F100. What rear end this is? Also, is it worth rebuilding, or would I be better off replacing it? I plan on putting a large cubic inch small block in front of it, so there will be a lot more oomph than the old engine.
Thanks in advance!!
Brian
Thanks in advance!!
Brian
Phantom of the Phorum
Joined: Jan 2011
Posts: 5,472
Likes: 1,696
From: Kentucky
That is not the original rear differential for your '54. What you have there is a Ford 9". The good news is, you can do almost anything with it. From limited slip to almost any gear ratio.
The original would be a Dana 44. It would look like this:
The original would be a Dana 44. It would look like this:
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New User
Joined: May 2017
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From: Phoenix, AZ.
Thank you
Thanks Effie!!
Do you know how I can find out more about this rear end? Is there some sort of identifier that would show make/model/part? I would imagine it could use at least a fresh set of bearings.
Do you know how I can find out more about this rear end? Is there some sort of identifier that would show make/model/part? I would imagine it could use at least a fresh set of bearings.
Lead Driver
Joined: Aug 2006
Posts: 8,093
Likes: 652
From: Brentwood, TN
The 9 inch will handle the larger cu.in. SBF fine. Since you have the rear end out of the truck then it will be a simple matter to open it up and get the answers you seek. It is a large bearing housing which is a good thing. You can measure the flange to flange width right now, this is a good data point to have for the future. When the axles are pulled you can count the splines...probably a 28 spline. Ring and pinion gears can now be accessed so that you can calculate the ratio. Pinion shaft seal is leaking and based on the general condition of the rear end you will probably want to do a complete rebuild on it. Good luck...
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Lead Driver
Joined: Dec 2012
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From: Wentzville, MO
See if this helps. I’d bet it’s from a 70ish F-100.
http://www.fordmuscle.com/archives/2002/02/nineinch/
http://www.fordmuscle.com/archives/2002/02/nineinch/
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New User
Joined: May 2017
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From: Phoenix, AZ.
Thanks everyone!! Charlie, you are right, it's a 28 spline. And I was able to ID it using BJ's link and moejr read the ID correctly. I ordered new axles with 5-4.5 bolt pattern to match the front discs. Off to get it rebuilt....
Fleet Mechanic
Joined: Feb 2015
Posts: 1,665
Likes: 111
From: southwest missouri
Brian I did not read BJ's article all the way but there is another on here that I have found great to use. I did the same thing you are doing. 57 thur 72 are the nine inch to use as they are plug and play. I have around 11 hundred in mine that is all new from end to end except axle and backing plates. I also put a yukon trac lock in mine and the only reason I did that is because the trucks are so light you spin on wet grass not that I drive on wet grass every day but I had it apart so what the heck.BJ I have it in and running. Brain I hope this helps .
Fleet Mechanic
Joined: Feb 2015
Posts: 1,665
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From: southwest missouri
1953 - 1956 F100 Rear End Selection and Rear Suspension Lowering - Ford-Trucks.com
Also check this out. BJ hope you had a good Christmas.
Also check this out. BJ hope you had a good Christmas.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
If from an F100 with 28 spline axle shafts, it could be from a 1967 or 1968/72. 1953/67's have 11" x 1 3/4" rear brakes. 1968/72's have 11" x 2 1/4" rear brakes.
The 28 spline axle shafts (B7TZ-4234-A 1957/67 F100 or C8TZ-4234-A 1968/72 F100) are the same right/left. The others have right & left specific axle shafts.
These F100's, Bronco's and E200's have 5 lug wheels on a 5.50" bolt circle. Cars w/9" could have 5 lug wheels on a 4.50" or 5.00" bolt circle.
Beginning 1973, Ford increased the width between the inner frame rails behind the cab from 33 1/2" (used thru 1972) to 37 1/2" on F100's, 1975 F150's.
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