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Old 07-13-2008, 01:01 PM
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Calculating 9 inch axle lengths from a housing

Ok guys I am having a problem here I have a 9 inch I shortened and I need to order axels for it. The housing is 56 3/16s wide I measure 27.5 from housing end to pinion center on the passenger side and 28 and 11/16s on the drivers side.

I know my brake offset and everything else. The only thing I need to do is measure or calculate the axle length to order new custom axles. While this seems easy I am finding it difficult to do even with a pumpkin that has the front cut away from it.

I have searched the internet and found no data other than a centered pinion 9 inch will have a difference of 4 inches between axles.

On top of this all I am needing to account for the small amount the bearings protude from the housing end on the 9 inch to get the dimensions they want.

Also I know there is some fudge factor as the axle splines are not going to be fully engaged. I however do not want to count on fudge factor when ordering axles for several hundred dollars.

Any guidance would be greatly appreciated. Thank you.

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Old 07-13-2008, 01:32 PM
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Go to a custom axle manufacturers web site( Moser, Mark Williams, Strange, Yukon, Dutchman, Randy's Ring&Pinion, or others) as they almost all have a custom axle spread sheet where you just fill in the blanks with the dimensions you have and they will build you the right length axles. Otherwise, if you have a manufacturer already in mind, call their sales and tech line and they will be able to set you up with the dimensions that you currently already know.
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Old 07-13-2008, 07:45 PM
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Here's a Corel drawing I made when I had mine narrowed...

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Old 07-13-2008, 09:36 PM
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Hrmm theres alot going on there but I think I'm following it..

Also wondering anyone know the pinion offset of a factory chevy 10 bolt from the 80s cars? I'm getting 11/16s offset... but its so hard to know if i am measuring right
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Old 07-13-2008, 09:50 PM
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Centered or not a 9" has a 4" difference in axle length and 2" pinion offset, Do you have a spool or posi if you have the posi you need to subtract 1.125" (9/16" from each axle) from the total length for the spider gear pin. Also what is the pinion offset you put in the housing when you cut it? It looks like you have 1.187 pinion offset so take that into account when figuring. I always center the pinion when I cut them and I get axles from strange they will build you anything you want and have a very good tech department. It will make your brain hurt sometimes trying to figure it out.
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Old 07-14-2008, 09:16 AM
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What I did was I built a jig off the 10 bolt that the 9 inch is replacing. Shortened the 9 inch on the jig and it is within 1/8 to 1/16th of the 10 bolt. I think I might have finally found the stock GM offset is 5/8s which means me being at 11/16s offset is pretty close.

I get the whole brain hurting thing.. Hopefully the guys I call up for the axels will be really knowledgeable.
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Old 07-14-2008, 09:28 AM
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the 9 inch ford axel flange is 2 1/2 inch past housing flange on both sides so if rear housing is 50" your rear end width will be 55". when you order your axel all they need to know is housing width , bearing size, spline,center or offset pinion
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Old 07-14-2008, 11:17 AM
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Alright I just ordered them this morning. Gotta tell you the guy at bears performance in ontario was great help and really friendly. He was able to look over my numbers and he told me they were ok even though I had a bit more pinion offset then a GM usually has he said I'm sitting fine.
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Old 07-14-2008, 10:17 PM
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Cool, that is the difference with the guy that does several sets a day instead of once in a blue moon. I narrow about one 9" a month but always center the pinnion if I don't have axles and if I have them I mock it up and do some measuring without a housing. Most of the stock ford brakes are 2 1/2" flange offset but I have built them with GM, Chrysler and Olds ends so you have to wach that as well.
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Old 08-01-2008, 10:41 PM
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Well I got the axles. I had 1 inch of engagement in the splines on the one side (factory splines were 1 and 1/8 engaged).. and the axle on the other side was about 5/16 too long. I just kept the thing cool and cut the extra 5/16 off as careful as I could. Glad it came out a little long than short. Should be ok and I had them send me the specs so when I do the next one I will just order the one 5/16 shorter and the other one 1/8 longer. I am almost wondering if he made them a little long as he could tell I wasn't sure on my dimensions. Either way it worked out good
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