Help! Need to make a 28 spline 8.8 31 spline - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-28-2010
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Help! Need to make a 28 spline 8.8 31 spline

I am currently having an axle (8.8) set up with 4.88's. I bought it because i was under the impression it was a 31 spline fx4 axle. My Mechanic just finished setting up the gears and told me the locker I bought and the carrier won't fit. This is because it is actually a 28 spline axle. Is there any way I can upgrade and put 31 spline shafts in it? I can't buy a new axle cause he has already spent the time setting up the gears. Help would be awesome.
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Old 10-28-2010
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Nope, it won't work.
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Old 10-29-2010
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You'll need a complete 31 spline axle, explorer or lvl 2 ranger
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Old 10-29-2010
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Are the shafts too big? So no one makes an upgrade kit? Can I have someone make the shaft bigger? I hate to sell my locker, carrier and get new ones.
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Old 10-29-2010
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There is no way to make it work, you need a whole nother axle.
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Old 10-29-2010
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There are a few main differences between the 28 and 31 spline 8.8.

The axle tubes and shafts are larger. And the diff housing axle tube holes are bigger as a result.

The ring and pinions are interchangeable and so are some lockers. I believe the entire carrier is interchangeable.

Besides the gears and maybe the carrier they are in no way compatible.


^^^^^^ IGNORE THIS PART ^^^^^^


31-spline 8.8s are only on Explorers, Full sizes, and FX4 Level II Rangers. FX4 Off road Rangers are still 28 spline.

Last edited by Masteratarms93; 10-30-2010 at 02:49 PM.
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Old 10-29-2010
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The carrier isn't interchangable. Thats where the splines are, so the count obviously would be wrong.
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Old 10-29-2010
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crap ok thanks guys.
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Old 10-30-2010
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Quote:
Originally Posted by Masteratarms93 View Post
There are a few main differences between the 28 and 31 spline 8.8.

The axle tubes and shafts are larger. And the diff housing axle tube holes are bigger as a result.

The ring and pinions are interchangeable and so are some lockers. I believe the entire carrier is interchangeable.

Besides the gears and maybe the carrier they are in no way compatible.


31-spline 8.8s are only on Explorers, Full sizes, and FX4 Level II Rangers. FX4 Off road Rangers are still 28 spline.
there are a few other differences, i suggest looking on TRS at there indepth looks at both. as for the axles, carriers, and ring and pinion do not interchange...
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Old 10-30-2010
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Originally Posted by fourliter dan View Post
there are a few other differences, i suggest looking on TRS at there indepth looks at both. as for the axles, carriers, and ring and pinion do not interchange...
Crap. I did a ton of looking before I posted that. I am tarded.

I could have swore that the ring and pinions were good to change out.

Well poop.
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Old 10-30-2010
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The 31 spline and 28 spline 8.8 do use the same ring and pinion...
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Old 11-02-2010
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I am am trying to get the salvage yard to send me a different rear end because they told me when I bought it that it was from a level II, so hopefully something works out. Thanks everybody.
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Old 11-02-2010
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Yes, the ring and pinion does interchange. They are both 8.8's.
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Old 11-02-2010
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Do you really need a 31 spline with your 3.0 and 33's?
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Old 11-02-2010
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Where did you get the rear end from? I ask because you said you had it SENT to you. I know there was a local yard here that kept trying to sell a Ranger rear end online out of an 04 FX4 as a Level II rear end. I went in and did all the checks and told them it wasn't a Level II. They said ok and continue to advertise it that way. Its a long shot but just checking.
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