28 Spline or 31 Spline (8.8)

[MSGia]

Good evening,
I have the axle code 95, does this mean I have 28 or 31 spline?

Reason I am asking is because I am considering the upgrade to a Limited Slip Diff.

 

[MSGia]

Well, turns out I didn't "please read here before posting" . I saw a different thread and it seems it's likely 28.

 

[scotts90ranger]

Yeah, only some very select FX4 level 2 Rangers got the 31 spline, all the rest are 28 spline...

 

[MSGia]

Yeah, only some very select FX4 level 2 Rangers got the 31 spline, all the rest are 28 spline...

Is it easy/possible to convert? I hear the 2010 and 2011 Rangers had the larger 3.25” outer diameter.

 

[RonD]

OK, here is the skinny, only the 2002 FX4, and 2003-2007 FX4 Level II’s came with 31 spline Torsen rear axles as part of the package, most if not all were 4.10
It was Optional in 2008/09 Level IIs

2010-12 Rangers have 3.25" outer tubed because of rear Disc brakes, not because of 31-spline or Limited Slip
Not sure there was a 31-spline after 2009 Level II

Swap out ring and pinion on your Code 95 to 4.10 and the guts/case to limited slip
If you have a 2010 then it has rear disc brakes, so if swapping whole axle you would lose that
The torsen 31 spline never came with disc brakes

 

[sgtsandman]

I don’t think the 2010-2011 axle can be upgraded to 31 splined axles. The bearings are different due to the larger diameter axle shafts and I don’t know if the bearings would fit in the axle.

The axle lengths are different since the 31 splined axles are drum brakes and the ‘10-‘11 axles have disc brakes.

Also, sensor locations are different. The ‘10-‘11 axles have splines for the ABS/speed/traction/stability control sensors at the end of the axle shafts near the hubs. I believe the FX4 uses a splined ring in the differential.

I’m sure there are other things I’m missing.

 

[MSGia]

Well, I found this, so I might not need to make the conversion. I was looking towards converting to 31 because I didn’t find any Limited Slip 8.8 with 28 splines. I was going to pair it with a 4.10:1 ring and pinion set and a bearing/hardware kit. The one I was looking at before was a Ford Performance 31 spline.

 

[sgtsandman]

I think the Tru Track is the worm gear LSD model. A good one to go with. No clutch discs to wear out and you don’t have to worry about the additive.

Torsen sells a worm gear LSD as well.

Everything else I’ve seen is clutch packs.

 

[00t444e]

Just put a Lock Right locker in it, easy install and it works great.

 

[MSGia]

Just put a Lock Right locker in it, easy install and it works great.

Aren’t those for off-roaders? My build is a street truck.

 

[sgtsandman]

A limited slip has better road manners for a vehicle that doesn't go off road. A locker will give better grip but can cause control issues in the right conditions that an LSD is less likely to cause but not impossible. For a pavement or gravel road only vehicle, an LSD is usually the better choice. But there are applications where a locker does make sense. Usually specialized cases but there are times when they make sense.

 

[don4331]

Technically, 31 splines are easier on 2010-11 axles as they already gave the larger axle bearing (1559) <One could just shorten & respline an Explorer or F-150 axle>. But if you don't have aftermarket power - V-8 or boost/aren't hard on parts, 31 spline axles aren't really necessary.

 

[85_Ranger4x4]

Technically, 31 splines are easier on 2010-11 axles as they already gave the larger axle bearing (1559) <One could just shorten & respline an Explorer or F-150 axle>. But if you don't have aftermarket power - V-8 or boost/aren't hard on parts, 31 spline axles aren't really necessary.

V8 Mustangs ran 28 spline for decades.

Lighter but with higher hp aspirations than the average Ranger owner.

 

[MSGia]

Thanks for all the help. I’m also trying to find out how many splines the end of the driveshaft is, I don’t know the official term haha. Reason is all of the ring and pinion kits are either 28 or 30 spline.

 

[don4331]

I think all OEM 8.8" axles are 30 splines on pinion aka pinion splines (1.312" diameter, 30* pressure angle)

28 splines are Ford 9" OEM (1.220 " diamter, 45* pressure angle). Aftermarket for 9" has lots of options.