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Old 09-18-2017, 02:08 PM
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1991 bronco rear end

Hey guys i grenaded the rear end in my 91 bronco last time i went 4 wheeling. I dont wanna dump a bunch of money into it because i plan on selling it soon. It has stock gearing. Will the 80-86 bronco rear end work in an exact swap with the 87-91 bronco. Or does some work have to be done. I have seen some rearends from the older years for sale. Thanks for the input in advance.
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Old 09-18-2017, 02:46 PM
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Or will the 92-96 rearend work.
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Old 09-18-2017, 03:12 PM
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any 87-96 stock bronco/f150 rear diff will work. some 80-84 bronco's had a 9" diff which you dont want to run.
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Old 09-18-2017, 03:43 PM
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Originally Posted by kx125str99 View Post
It has stock gearing.
There was more than 1 gear ratio available so you need to make sure the replacement has the same gearing.
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Old 09-18-2017, 06:09 PM
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Originally Posted by Conanski View Post
There was more than 1 gear ratio available so you need to make sure the replacement has the same gearing.
The diff cover doesn't have the tag on it anymore. Is there any other way to tell what gear ratio is in it.
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Old 09-19-2017, 10:33 AM
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i believe there is a way to turn the axle shaft and count the rotations of the pinion. or if you pull the cover it may have the gear ratio on the ring gear.
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Old 09-19-2017, 11:14 AM
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The most sure fire way to check the ratio is to divide the number of teeth on the ring gear by the number of teeth on the pinion gear. The easiest way kind of depends on how badly damaged the rear axle is.

If you do go shopping for junkyard axles, pull the cover and inspect the internals and both shafts as well. The shafts wear out where the axle bearing rides.
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Old 09-26-2017, 08:23 AM
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The diff cover doesn't have the tag on it anymore. Is there any other way to tell what gear ratio is in it.
What is the axle code on the drivers door pillar.
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Old 09-30-2017, 09:50 PM
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Also look at the front axle tag.
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