31 spline axles
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31 spline axles
I ended up trading an old turbo I had lying around for a 9-inch center with a Detriot locker this last weekend... not bad for my $50 turbo 
However, it is a 31 spline rear, and it turns out I currently have a 28 spline in my truck. Where is the best place to get 31 spline axles for the older 9 inch with a 5x5.5 bolt pattern? Everything out there seems to be for Broncos. Will those fit?
However, it is a 31 spline rear, and it turns out I currently have a 28 spline in my truck. Where is the best place to get 31 spline axles for the older 9 inch with a 5x5.5 bolt pattern? Everything out there seems to be for Broncos. Will those fit?
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Full size Broncos through 96 use the 5x5 1/2 pattern. When Ford went to 31 spline on the pickups they had widened the rear axle assembly. There may be a few 72 and earlier 31 splines, but I wouldn't hold my breath while looking for one. IMHO
John
John
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My '72 has a 31 spline in it and I believe it is a little rare. Moser and some other axle manufacturers will have what you need. Just take them your 28 spline axles for length comparison and let them measure them.
Ford Parts Specialist
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From: Simi Valley, CA
1968/72 28 vs 31 spline axles
28: C8TZ-4234-A .. Bolt Pattern: 5.50 / Length of Shaft-Less Flange: 29 15/16" / End Spline Diameter: 1 1/4" / Flange Diameter: 7 1/16" (This matches 28 spline axle OP has)
31: C8TZ-4234-B .. Bolt pattern: 5.50 / Length of Shaft-Less Flange: 29 13/16" / End Spline Diameter: 1 11/32" / Diameter of Flange: 7 1/16" .. This 31 splined axle is used with a 9" or 9 3/8" Ring Gear. The 9 3/8" Ring Gear was not available with a 28 splined axle.
From 1968/72, the 31 splined axle was an option on all F100's except one. It was the standard axle on 1968/72 F100 Camper Specials. C/S's used the 9 3/8" Ring gear.
John: NOTE: Ford widened the axles in 1973. 1968/72 28 and 31 splined axles use identical housings.
31: C8TZ-4234-B .. Bolt pattern: 5.50 / Length of Shaft-Less Flange: 29 13/16" / End Spline Diameter: 1 11/32" / Diameter of Flange: 7 1/16" .. This 31 splined axle is used with a 9" or 9 3/8" Ring Gear. The 9 3/8" Ring Gear was not available with a 28 splined axle.
From 1968/72, the 31 splined axle was an option on all F100's except one. It was the standard axle on 1968/72 F100 Camper Specials. C/S's used the 9 3/8" Ring gear.
John: NOTE: Ford widened the axles in 1973. 1968/72 28 and 31 splined axles use identical housings.
Last edited by NumberDummy; Mar 27, 2007 at 07:06 AM.
Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by jowilker
Correctamondo Mr. Bill, Knowing about it is one thing, finding one is another. 
John
John
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NumberDummy,
What are the over-all axle widths of the pre-73 as compared to the post-73? And would the Ford 9" and the semi float DANA 44 or 60 rears be the same width for the same years?
WMS to WMS measurements?
Thanks,
Brad
What are the over-all axle widths of the pre-73 as compared to the post-73? And would the Ford 9" and the semi float DANA 44 or 60 rears be the same width for the same years?
WMS to WMS measurements?
Thanks,
Brad
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