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Old 10-13-2005, 08:29 PM
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Another 9 inch question...

So, I've decided to get a 9 inch for the rear for my project. I've read several right ups about the different variations through the years. One great source was:
http://www.kevinstang.com/Ninecase.htm
I've found someone that has a bunch of them but, I'm making the assumption that the tags might not be on them (even if they are, some years the tags had minimal info), the person probably doesn't know what they came out of, etc.
So with this in mind, how do I figure out if it's a 31 spline without taking it apart? About the only characteristic that I've picked up on so far is looking at the spline shaft end for the two outer holes in the center hub. BUT, I gather that this is not always a guarantee either.
Is there another way to identify a 31 from a 28 without pulling it apart?

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Old 10-14-2005, 12:38 AM
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9 inch

I think most 28 spline axle housing ends taper where as 31 are even all the way.
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Old 10-14-2005, 12:44 AM
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Here is the best Ford rear end site I have found. This guy seems to really know his stuff. He describes some indicators for the 28/31 spline shafts about 3/4 down the article but says they are not fool-proof. I think you are stuck with pulling a shaft and counting the grooves to know for sure. Actually pretty easy with these reare ends. Take off the wheel and brakes on one side, take out the 4 retaining bolts and pull the axle. May need a slide hammer to coax it out but the job is pretty easy.
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Old 10-14-2005, 02:50 PM
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Thanks!
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Old 10-14-2005, 09:38 PM
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If you have to use a slide hammer to pull the axles, be careful they can pinch you. I had to get 10 stitches in my hand 2 years ago trying to pull a Ford 8" axle with a big slide hammer.... all I can say is ouch......
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Old 10-14-2005, 09:56 PM
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I'd say 10 stitches qualifies as a little more than a pinch!!
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Old 10-14-2005, 10:03 PM
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Quote:
Originally Posted by willys36@aol.com
Here is the best Ford rear end site I have found. This guy seems to really know his stuff. He describes some indicators for the 28/31 spline shafts about 3/4 down the article but says they are not fool-proof. I think you are stuck with pulling a shaft and counting the grooves to know for sure. Actually pretty easy with these reare ends. Take off the wheel and brakes on one side, take out the 4 retaining bolts and pull the axle. May need a slide hammer to coax it out but the job is pretty easy.
1) Musky, most housing don't taper, but some do. No 31s do that I know of.
2) 3100, Check the backing plate 4 bolt hole dimensions. I have never seen a 31 spline in a small housing.
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Old 10-14-2005, 10:30 PM
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Quote:
Originally Posted by xntrik
1) Musky, most housing don't taper, but some do. No 31s do that I know of.
2) 3100, Check the backing plate 4 bolt hole dimensions. I have never seen a 31 spline in a small housing.
Check backing plate...cool
Stitches...not cool
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Old 10-17-2005, 12:17 AM
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9 inch

Undo the four backing plate bolts and nut , then I usually hook a piece of chain on two wheel studs with two lug nuts then a piece of pipe in center for leveage and jerk out axle. What i was saying earlier: There are 9 inch rears that get narrower at the outer ends and some stay the same size all the way out to end bearing. Ive found the narrow ones have 28 in cars and trucks.
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Old 11-07-2013, 11:50 PM
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You can flip the brake drum around,put on a couple lug nuts just a turn or two on and itll work just like a slide hammer.
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Old 11-08-2013, 07:19 AM
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There is no way to tell a 28 from a 31 spline axle without pulling it out. I have 28 and 31 spline axles that have the 2 holes in the end. The tapered housings have 28 and 31 spline axles. The small housings used in Mustangs and Fairlanes used 28 and 31 spline axles, depending on what engine and transmission was used. The only way to know for sure is to remove the axle.
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Old 11-08-2013, 08:40 AM
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bullwhip chain

If you don't have a big slide hammer, wrap the chain around tight and hook it then with some slack in the chain bullwhip it. usually a time or two will pop it out.
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