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Old 03-26-2020, 07:54 PM   #1
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Axle Spline Count

I need to change up my differential gearing with a tire size upgrade and want to do the lockers at the same time.
I have the following differential tags and best I can figure is the front and back are both Dana Super 60ís, open diffs with 3:73 gears ( need 4:10ís now)
The real question is spline count. Is there anyway to figure out spline count from this without taking the axles out and counting.
The van is a 2013 e350 Quigley
Appreciate any thoughts - thx
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Old 03-27-2020, 12:25 AM   #2
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According to this page, your second image is 35-spline.

I was unable to find the first BOM number, but anecdotally from the data in the table and the fact that it's a 2013+ F350 axle I'm guessing it's also 35-spline. I'm no axle expert though!
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Old 03-27-2020, 07:33 AM   #3
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Kibo - thanks for this. I had found a bunch of pages and hence got only so far but the link you attached I hadn’t found in my search so answers a lot - much appreciated
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Old 03-27-2020, 07:58 AM   #4
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Fronts Superduty axles should be 35 spline.

Your rear axle, if it's original, should be a 35-spline semi-float Dana 60.

Any idea how heavy your van is on the rear axle? Heavy extended-body vans with a heavy buildout, often exceed what that axle was designed for, and there's been several failures here over the years. If you're over the stock rating (6,350 IIRC) or you're running much larger than stock tires, you might want to sink you $ into a stronger axle instead.

For what you'll spend on a locker, you can probably pick up a used F250 axle instead, and those have a factory e-locker option, and will match your front bolt pattern.
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Old 03-27-2020, 09:04 AM   #5
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The van currently scales at 7100 lbs. I’m running 285/70/17 with an Agile RIP upgrade on the suspension. Build out is in process but there will be very little over hang weight beyond the rear axle line. Currently have an Aluminess box, tire carrier and bike racks. Inside would simply be the Laveo in the back corner. All weighty things would be between the axles. I’m thinking around 8000 lbs all done and loaded including water tanks full.
However it is still an issue potentially and a concern a lot of folks have. Presumably I could move an Eaton Trutrac that I’m looking at for the rear from the semi float to a full float replacement or a conversion to full from my semi?
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Old 03-27-2020, 10:27 AM   #6
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The rear axle would appear to be a full float already so should be good for any upgrades
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Old 03-27-2020, 10:43 AM   #7
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Quote:
Originally Posted by Farmbro View Post
The rear axle would appear to be a full float already so should be good for any upgrades
You would have to look at the end of the hub to see if it's SF vs FF. The brake backing plate between either is identical.
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Old 03-27-2020, 10:45 AM   #8
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That looks like my semi-float?

Look at the hub from the outside. If the hub protrudes with a series of bolts (8?), it's a full floater--the bolts are attaching the axle hub to the wheel hub.

If the hub doesn't protrude and/or doesn't have bolts, it's a semi-float.

[edit: carringb beat me to it!]
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Old 03-27-2020, 04:22 PM   #9
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IMO, putting a locker in a semi-float with oversized tires, its asking for trouble, especially since your van is already running adapters. A tru-trac should be ok.

You can transfer the true-track to another Dana 60 even if its full float. But the Sterling axle swap is simply a better match for a Quigley conversion IMO. You would not be able to swap a Dana 60 Tru Track into a Sterling.
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Old 03-29-2020, 11:50 AM   #10
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Thanks all, now that it stopped raining I have verified it is a semi-float unfortunately and so further thought required. Will investigate the Sterling axles and the full float Dana assembly which I may be able to pull from a wrecker locally to minimize the bill.
Presumably a full float from an ‘09 forward f350 should be a reasonably clean swap?
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