28 vs. 31 spline 8.8 - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 09-07-2008
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28 vs. 31 spline 8.8

Does anyone know how much difference there is in a 28 spline vs. a 31 spline. I know the 31 holds more weight but other than that is there really much more difference. My ranger has a 28 spline 8.8 and i think the 31 is only better for hauling heavier stuff. Right?
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Old 09-07-2008
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I personally wouldn't upgrade unless I was running a good amount of horsepower/torque or doing some really wild off-roading. 8.8 28spline is overkill for my mostly stock 3.0L, in my opinion.
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Old 09-07-2008
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Old 09-07-2008
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Quote:
Originally Posted by [email protected] View Post
Does anyone know how much difference there is in a 28 spline vs. a 31 spline. I know the 31 holds more weight but other than that is there really much more difference. My ranger has a 28 spline 8.8 and i think the 31 is only better for hauling heavier stuff. Right?
The 31-spline Ranger 8.8 axle assembly is rated for 3600 lbs. max compared with 2750 lbs. for the 28-spline. It doesn't matter much for carrying capacity though since either axle can handle more than a Ranger's rated payload.

For a Ranger, especially a 4x4 Ranger with its low range torque multiplication, an important difference is in the inner axle shaft strength. The 31-spline shaft is about 25% larger in cross section which should make it roughly that much stronger in torsion.
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Old 09-07-2008
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Another big thing is that the 31-splines can easily be converted to disc brakes. I'm referring to Ranger 31 splines of course, Expo's already have disc brakes.

Last edited by 04blackedge; 09-07-2008 at 10:41 PM.
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Old 09-07-2008
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another advantage... kinda... for the 31 spline is that you ave a larger selection of differentials. example, the Aussie locker is only available for the 31 spline
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Old 09-07-2008
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are all FX4 rear ends 31 spline?
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Old 09-07-2008
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All Level IIs are, I'm not sure about just the regular FX4
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Old 09-07-2008
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Originally Posted by CJGSAY View Post
are all FX4 rear ends 31 spline?
No, only these Torsen equipped Rangers are also 31-spline:
  • 2002 FX4 Off Road
  • 2003~2007 FX4 Level II (but not FX4 Off Road)
  • 2008~2009 FX4 Off Road (only when equipped with the "XR8" option - Torsen diff/31-spline/4.10 ratio).
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