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Old March 9th, 2007, 11:20 AM   #1
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Default CTM vs Yukon vs Spicer vs Longfield..

an interesting little test of Dana 60 u-joints

http://www.longfieldsuperaxles.com/i...StressTest.pdf

Not exactly the same loading as in an axle, but still, its a shearing force so its a good relative idea.
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Old March 9th, 2007, 12:25 PM   #2
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Interesting and fairly accurate in a condition where a tire was bound up and enough torque was applied through the drive line to force a break.

I have D44 Yukons in alloy shafts that I just disassembled last weekend after a year of use for inspection purposes. They looked and felt perfect. Prior to the Yukons, I only used Spicer and I wiped out at least one set per year.

I wish they had gone further and did a material and hardness study.
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Old March 22nd, 2007, 08:24 AM   #3
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1 = longfield = 162,400lbs
2 = ctm = 158,732lbs
3 = yukon = 92,599lbs
4 = spicer = 48,649lbs

pretty good test
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Old March 22nd, 2007, 08:45 AM   #4
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i ordered two of the 60 joints for my new axles from longfield last week.
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Old March 30th, 2007, 01:56 PM   #5
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That is some good info but the testing fixture was loaded above its ultimate strength, thus plastically deforming. Do to this deformation the fixture was not the same in dimensions for every test. Ya it might not sway the results much but I know most places this would not fly as a good test. I know it would not up here.

They don’t have the specs for the material used in the test fixture. But obviously it didn’t have the correct material properties for the test. I would assume structural steel having an average ultimate strength of 66 ksi. Using such a material as a test fixture when the shafts are run in 4340 heat treated shafts having material ultimate strengths of 150 ksi compressive and tensile, 95 ksi in shear.

I after seeing this test am intrigued to test some joints myself. A Spicer 760, Spicer 297 and a “cheap” joint. Also two the three of each joint will be tested to rule out manufacture defects. As all of these joints are not made from materials having high ultimate strengths comparable to that of “bling” joints only elastic deformation at most should take place to the test fixture. I believe the university already has some fixtures for testing joints but I might have to make my own for the particular joints I want to test.

If and when I do this expect a full writeup.
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Old March 30th, 2007, 02:42 PM   #6
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I'd be careful about making assumptions on what material was used in the fixture. I'd also not expect the pattern of deformation on that particular fixture to significantly effect the point that the crosses snap.


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