Originally Posted by Hunter195293
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.
4L10 88 3E15
and it has the lubrication tag:
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.