FX4 Axle code - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-17-2009
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FX4 Axle code

I have the Sh*t 3.27 27 spline axle and am looking at swaping the front and rear and want to get a 31 spline with 4.10's What is the Axle tag show for the model # on a FX4 31 spline 4.10 8.8 axle with limited slip traction lock
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Old 12-17-2009
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look for a ranger rear axle with the tag stating it can only have synthetic fluid...

your front can only be swapped with axles up to 1997 vehicles if thats your truck in your avatar you dont have SLA suspension.
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Old 12-17-2009
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Are you saying you have a 7.5 rear axle? Your Ranger (being 4x4) should have an 8.8 in it...
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Old 12-17-2009
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Quote:
Originally Posted by _97_4X4_ View Post
Are you saying you have a 7.5 rear axle? Your Ranger (being 4x4) should have an 8.8 in it...
Having a 4x4 doesn't mean your going to have the 8.8... for example mine is 4x4 and has the 7.5.
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Old 12-17-2009
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I have a 8.8 but with 3.27 gears and the 27 spline axle but i want to replace the rear axle with an 8.8 from a fx4 because it has the 4.10 gears limited slip gears and a 31 spline axle i already got a dana 44 strait axle from an early bronco with 4.10 to mount in place of my twin traction beam dana 35
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Old 12-17-2009
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that axle is extremely hard to find prob easier to get an explorer axle being it sounds like your gonna do some custom work, welding on some spring perches shouldnt be a problem
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Old 12-17-2009
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Quote:
Originally Posted by Hunter195293 View Post
What is the Axle tag show for the model # on a FX4 31 spline 4.10 8.8 axle with limited slip traction lock
The 31-spline Ranger axles were never offered with the Traction Lok clutch-type limited slip. They were all equipped with Torsen geared L/S.

Factory Explorer 31-spline axles can be found with either open or Traction Lok. The problem with those is that they don't work in a SOA Ranger app without welding on perches and shock mounts. Not impossibly difficult but not bolt-on either.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

FWIW, these are the characters from the tag from my 2003 FX4 Torsen 31_spline. Some of them may be coded production info or may differ by year, so don't necessarily expect to find an exact match.

N313L
4L10 88 3E15


and it has the lubrication tag:

75W140 SYNTH
OIL ONLY


The second tag is a dead giveaway because, on Rangers, only the Torsens specify 75W140 synthetic lube.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here's an easy check that can be done without referring to axle tags or markings. Measure the diameter of the axle tube between the spring perch and the diff housing. A 31-spline Level II axle tube is about 3 1/4" diameter and a non-LII is something like 3".

If you don't have a caliper or micrometer handy to measure the diameter, wrap a string around the tube and mark the circumference. Then transfer the string measurement to a tape or rule.

A 31-spline should be about 10 1/4"
A 28-spline should be about 9" ~ 9 1/2"

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Be very careful of any 2002MY Torsen-equipped Ranger axle because there was a safety recall due to the Torsen diffs fragging. Replaced axles have a special tag on them, purple IIRC. Those warrantied axles should be OK and Torsens in FX4s assembled after January 28, 2002 should be OK as well. The later good axles probably don't have the purple tag.

Here's the problem: Since the early failures were reported on manual FX4s, Ford warrantied the axle assemblies on the manual trucks ONLY, choosing to NOT recall the exact same Torsen diffs in the early 2002 automatic FX4s. Predictably, IMO, the suspect diffs in the automatic trucks have also been known to fail over time. Obviously, any of these early Torsen diffs are to be avoided.

ALL FX4s, manual or automatic, assembled after January 28, 2002 came with the updated good diffs. If you have access to the axle donor, you can look at the build date on the door jamb. Or, if you know the VIN of an early manual donor, a Ford dealer can tell you if the axle was ever replaced under Safety Recall #02S32.
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Old 12-17-2009
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Thanks that is just what i was looking for
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Old 12-17-2009
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Good luck at finding one. I have never seen one in the yard. Why not just go with an explorer axle?
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Old 12-17-2009
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chances are i will go with the explorer axle but i know some people that have some junk axles they picked up from some of the rangers and explorers that were torn down after the cash for clunkers program
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Old 12-17-2009
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The second tag is a dead give away, yes. But if the tags are gone, you can visually identify it as well...without pulling the cover off the axle. Take a peek at the end of the axle housing on the backside of the brake flange....

Take a look at these pics....

28spline
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31spline (note the pretty decent step down)
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The bearings outer diameter is the same between 31spline and 28spline. To make up the difference, the size of the axle tube diameter is visually stepped down compared to a 28spline.

Also, if you see the donor vehicle, you can pretty much figure it out. 2002 Fx4, 2003+ Level II, select 08-09 Fx4's. Axles are super rare...hell the trucks are super rare period.
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