Early Bronco differential width, 9 inch or 8 inch? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-31-2010, 02:55 PM
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Early Bronco differential width, 9 inch or 8 inch?

Were any of the early Bronco built with 8 inch differentials or were they all 9 inch diffs in the early years?

Were the wheel bolt patterns 5 x 5 for the early Bronco?

I've got a 1961 Bug Eye Sprite. I was told it has a narrowed differential via the use of a Bronco axle housing with the long side cut off and another short side tube Bronco housing welded on.

The housing is an 8 inch, with 5 lug on a 4.5 inch bolt pattern for the wheels.

This Sprite was built around 1972 - 73 with Ford V8 power

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Old 12-31-2010, 03:46 PM
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As far as I know, all the early Broncos were Ford 9 inch. The Trannys and transfer cases went through some small changes like Dana 30, 35, 40 and Ford and New Process. They were all 5 lug big car/pu bolt pattern.

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Old 12-31-2010, 04:10 PM
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jeffs bronco graveyard can answer your ?

http://broncograveyard.com/
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Old 12-31-2010, 04:30 PM
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i have the tag off the center chunk.. reads:

WCL - A

3.00 2LB 801

my research indicates a 1963 Fairlane diff, built in late 1962 with 3.0 gear

The width of the axle from wheel hub surface to hub is 49 3/8 inches

that width does not come up on the sites I have searched for difff widths
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Old 12-31-2010, 05:04 PM
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I bought a 1967 Bronco rearend with axles

I pulled a 3.7 ratio 9" with saginaw 3 speed overdrive. I bought it for 35.00, after 5 years of driving with the forty coupe, I heard some sounds in the rear and I pulled the axles and saw where the housing was bent all that time. I think the bronco was a rock crawler. Took it to the speed shop and they rebuilt chunk and straightened with a new axle. It is now smooth.
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Old 01-01-2011, 03:48 PM
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At this point, I know that it is not a 9 inch from a Bronco, since this differential is 8 inch.

I have tried to upload some photos I took of the narrowed axles on this unit. I think some folks here will enjoy the pics

There is a error message that pops up when I try to process the photos into the HR gallery. Hope Jon has an answer soon
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Old 01-02-2011, 07:37 AM
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Bronco 9"

I measured another housing with the rest of the 67 bronco. I think I remember the housing was about 58". I bought a axle from Bronco graveyard, the machine shop confirmed it as a 9". I wanted to get a housing of 9" with 59.5". That was the original of the 1940, 3/4" short on each side. Knowing now I can put a wider rear rims with fulling up the rear fenders with options. Since the 500 cad might light the 16x6.50 cokers, and they are very expensive.
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