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Old 12-02-2013, 09:17 AM
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Ford 9 narrowing (brake rotor size)

I bought a ford 9in rear end to narrow for an s10 project I'm working on. The rear end has disc brakes but the Axel bolt pattern isn't correct for the weeks draglite wheels I have. Are all rotors the same thickness and offset? I was going to measure rotor-to-rotor on the surface that mates with the wheel, for a starting point to narrowing the housing but I'm afraid the new rotors I get will be a different thickness or something. Are they all the same thickness? If not how can I get around this? I can't buy axles and new rotors yet because I dont know the axle length once the housing is shortened.

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Old 12-02-2013, 09:29 AM
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9 3/8 ?

Is it a 9 3/8 out of a lincoln or big Merc? they had a 5 on 5 wheel patern.
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Old 12-02-2013, 11:28 AM
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I will have to measure but I am planning on swapping for new axles anyway. Just needed these to measure the width
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Old 12-02-2013, 12:40 PM
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The Lincoln Mark 5 rear ends had 11 inch rotors and 5 on 5 pattern. The Lincoln Versails (probably spelled wrong) had 10 inch rotors and 5 on 4 1/2 pattern. Which rear end do you have? Most of the rotors that I have seen were around 1/4 inch thick where they mate with the axle flange.
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Old 12-03-2013, 07:20 AM
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Thanks for the replies guys. I will measure this afternoon and get back to you. I took the axels out last night and they are 28 spline. One side had a normal bearing and one has a conical bearing, I beleive this came out of a circle track car or something.
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Old 12-03-2013, 09:21 AM
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Those bearings are interchangable. You just have to be sure that you use the correct seal with the bearing that is used. That rear end would have had the tapered roller bearings originally.
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Old 12-03-2013, 09:25 AM
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That is good to know. I have a lot to learn about this rear end...Do you know where I might find the basics about it such as years, identification, splines, bearing and axle size, etc? Or am I best off just searching the threads for this info?
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Old 12-03-2013, 11:05 AM
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Most car axles are 28 spline. The late '60 and early '70s full size Mercury and Lincoln cars got 31 spline axles and the special high performance Mustang, Cougar and Fairlane cars got 31 spline axles. Many of the trucks had 31 spline axles, but they also have the 5 on 5 bolt pattern.

The drag pack cars got the nodular case with the 3 1/16 inch bearings. Some of the trucks also got this case, but there was another nodular case that was used in trucks that had 2 7/8 inch bearings. This one isn't as strong because it has gray iron caps instead of the nodular iron caps that are used on the other case. Most nodular cases also got the Daytona pinion housing, but I have seen them with a standard pinion housing. The WAR and WAB cases are the weakest of all, even though from the front they look very much like the nodular case. These cases should not be used for anything more than a stock daily driver.

The smaller car housings used small axle bearings. The full size cars and trucks had the large axle bearings. These could be either the sealed ball bearings or the tapered roller bearings.

The '57 to '64 housings were smaller and better looking, but not very strong. The axle tubes are but welded to the center. The housings with the longer tapered center are much stronger, but not very good looking. These are also harder to mount ladder bar or 4 link brackets. The car housings with the long tapered center usually have axle tubes that are mashed flat on top. The truck housings have thicker axle tubes and are usually the best choice for a high performance car.

The Ford Traction Lock is not a very strong differential, even though it has 4 pinion gears. The left side cover of the case is the weak part and it will crack and break off if stressed too much. I've seen many of these that were broke. There are after market versions of this differential that are much stronger. The Truetrac and Detroit Locker are also strong differentials for the 9 inch.
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Old 12-03-2013, 01:42 PM
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I have a Lincoln Versailles rear end out and sitting on a concrete pad. If I can take a measurement or a picture that will help, let me know.

John
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