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I also believe the 1550 joints are used in the wide track axles to allow greater steering angle, compared to the 1480 joints. So while straight up strength of the OEM shaft will probably be limited to the material, off the shelf great turning angle, might be worth it.
 

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Is there a typo on the left hand shafts here? Is the second Assy suppose to be #2? Not complaining Pat. I want to bookmark for later.

2006 F-550
Option #1 & 2 both uses 1550 joint
Stub shaft #53694, 7.5" long
Right Hand Shaft Assy #1 = 85155-3
Inner shaft #84919-5, 41.36" long
Right Hand Shaft Assy #2 = 2006821-1
Inner shaft #84919-5, 41.37" long
Left Hand Shaft Assy #1 = 85155-4
Inner shaft #84919-6, 19.12" long
Left Hand Shaft Assy #1 = 2006821-2
Inner shaft #84919-6, 19.12" long
 

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hi-steer ninja
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3,183 Posts
I am seeing 2013-2015 part numbers? aannnnd, interestingly, in the 6k 25-350 axle group, I see two different axle numbers for all gear ratios, but, no info.. my 2013 f250 has 1480 shafts with 3.55 gears, me thinks the difference is 1480 or 1550 shafts, off to try to find out..
2013564-1,2
2013443-1,2
 

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I am seeing 2013-2015 part numbers? aannnnd, interestingly, in the 6k 25-350 axle group, I see two different axle numbers for all gear ratios, but, no info.. my 2013 f250 has 1480 shafts with 3.55 gears, me thinks the difference is 1480 or 1550 shafts, off to try to find out..
2013564-1,2
2013443-1,2
Those both use 1480's. (I already listed the first part number.)

Here'e the link to the XGI (Axle General Information) catalog I use to look this stuff up. (I figured you would have this or even something better.):

http://media.spicerparts.com/cfs/files/media/f6kdF4QQcJpC8dpTo/xgi.pdf?token=eyJhdXRoVG9rZW4iOiIifQ==&store=original

I simply use the search function to find the part numbers. (Don't use the -1, -2.)

You can also use the search function to search for the 1550 part number (SPL70-4X) which nets all shafts that use it. There are literally only 3 or 4 pairs of shafts made by Spicer that use it. All have been listed in this thread already. They are all super-long shafts made for either the 550 axles or 350 wide track axles and they are all within 1/2" of each other.

The date on that catalog is August 2014. So unless they have made a new shaft in the past 1.5 years, sadly, I don't think that a 1550 shaft exists that fits a 250/350 housing.
 

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Those both use 1480's. (I already listed the first part number.)

Here'e the link to the XGI (Axle General Information) catalog I use to look this stuff up. (I figured you would have this or even something better.):

http://media.spicerparts.com/cfs/files/media/f6kdF4QQcJpC8dpTo/xgi.pdf?token=eyJhdXRoVG9rZW4iOiIifQ==&store=original

I simply use the search function to find the part numbers. (Don't use the -1, -2.)

You can also use the search function to search for the 1550 part number (SPL70-4X) which nets all shafts that use it. There are literally only 3 or 4 pairs of shafts made by Spicer that use it. All have been listed in this thread already. They are all super-long shafts made for either the 550 axles or 350 wide track axles and they are all within 1/2" of each other.

The date on that catalog is August 2014. So unless they have made a new shaft in the past 1.5 years, sadly, I don't think that a 1550 shaft exists that fits a 250/350 housing.
Something the xgi catalog doesn't list is heavy duty axle applications. I haven't been able to find a catalog that does list them. But I wonder if some other front axle they make for bigger trucks might use a 35-spline shaft with a 1550 joint that is different in length from what I've listed.
 

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hi-steer ninja
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ok, see them now 1550 shafts but longer. the only other option I found is dana's new jeep ultimate 60 axle, it uses the 1550 shafts with different outers for spindles. the center section is offset differently it appears, so probably still a re spline deal.. what is the going rate to cut and spline inners?
 

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ok, see them now 1550 shafts but longer. the only other option I found is dana's new jeep ultimate 60 axle, it uses the 1550 shafts with different outers for spindles. the center section is offset differently it appears, so probably still a re spline deal.. what is the going rate to cut and spline inners?

The Dana Ultimate 60 shafts are 4340 chromoly also, so they might be worth re-splining
 

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I wonder if the Spicer ultimate 60 knuckles/outers will be available separately and for a reasonable price (comparable to other aftermarket knuckle/spindle/hub/stub shaft/brake setup)

I know it would be "expensive" but it might be a worthwhile upgrade to a cheap junkyard D60...

Realistically the front ultimate 60 isn't priced that bad for what it is...


Or the dynatrac XD60 outers.


Both of these axles come with 4340 1550 shafts (I would assume they use the same shafts)




I would also assume you could use the 05+ dynatrac freespin kit with stock knuckles and their 1550 stub shafts.


But by the time you bought all that, you could just buy RCVs... And that's big stub Rockwell size joints.
 
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