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if you want to pretend your 350 has a super60 then so be it. those extensions have nothing to do with the bigger knuckles of a true super60. your paper says nothing about tube thickness either. i suggest actually comparing both differentials visually before posting again
Thanks for all the input guys, I have noticed occasionally I get a loud clunk from the rear end, like driveline slack or excessive back lash. Is this fairly normal?
if you want to pretend your 350 has a super60 then so be it. those extensions have nothing to do with the bigger knuckles of a true super60. your paper says nothing about tube thickness either. i suggest actually comparing both differentials visually before posting again
I have a 2011 550 diesel 4x4 dump sitting in my yard. Axles are identical, save for the ends.
Like I already acknowledged, the 450/550 have the "wide track" version which essentially has extensions on the end of the axle with different knuckles which allow for sharper turn in since there is more clearance. The differential, axle half shaft diameter and spline count...even the axle u-joints...all the same. The 450/550 does have an arbitrarily higher rating...7k vs 6k...based upon GAWR specs for the specific application by Ford. The axle itself is no stronger. Here's the spec from the 2017 Ford body builder's guide:
Its a massive axle and the ring gear is 11.8". The ABS sensors are inboard near the diff. The available ratios are 3.55 and 4.10 for the 350 dually, and 4.30 for the 450. There is an optional limited slip. The 450 uses larger diameter half shafts with more splines - that is the primary difference.
Do you know what the actual axle rating from Dana is for the m300?
if you want to pretend your 350 has a super60 then so be it. those extensions have nothing to do with the bigger knuckles of a true super60. your paper says nothing about tube thickness either. i suggest actually comparing both differentials visually before posting again
Wow really? The knuckle is not the axle. Different part altogether.
if you want to pretend your 350 has a super60 then so be it. those extensions have nothing to do with the bigger knuckles of a true super60. your paper says nothing about tube thickness either. i suggest actually comparing both differentials visually before posting again
So let me get this straight... The folks that engineered and built the trucks are wrong and you are right.
Ford and Dana have muddied the water on the 'Super' designation; yes, it's true all 2005-up 60s are Super, due to the 3.75'' inch tubes and larger-than-standard-60 inner Cs/knuckles.
However, the 'true' 'Super' 60 is only available in 450/550 trucks with 19.5 wheels.
Tubes on these are 0.5'' thick, and have massive Dana 70 inner Cs/knuckles to achieve the 7000 lb rating. I have one in my garage right now, trying to get 17 inch wheels to fit.
For 2017, the 250/350 units are different in that they use .370" thick tubes, smaller Cs/knuckles, and of course the narrow track. Every rotating component is the now the same though.
Good info, DSLTRK60. It appears I was incorrect, which happens plenty of times. I was just basing my info on the appearance of the axle tube size and diff size, which appeared to be the same as the 550. I never disputed the ends of the axle were different, obviously. Willynilly...apology accepted?
Troverman is 100% correct that the F250/350/450 all use the Dana Super 60 axle. The 450/550 runs a Wide track version of this axle that is approximately 6" wider overall.
The issue is what is meant by "Super"... This is a marketing term and not a technical term. If Dana thinks they are Super, then they are indeed Super.
Of course all Super 60's are not created equal. It's like saying all F350s should be the exactly the same. Super 60 is a model, and is equipped or modified for each purpose.
Anyone count the splines on one of our front driveshafts? Supers are supposed to have 35, while regular 60s are supposed to have 30.
