Ubolt Torque? LML

[Jacy_dzlguy]

What is the proper torque for rear axle ubolts on a 2011 2500? Sorry if it is posted somewhere, i searched and couldn’t find anything. Thanks!

 

[TheBac]

For my '03 truck, its 110 ft/lbs. But thats with 5/8" U-bolts. Your's are 18mm -- larger diameter. Guess that at least gives you a starting point.

 

[DAVe3283]

From here:

103 lb-ft, then tighten another 180°.

Like the manual says, be sure to use new u-bolts and nuts every time. They may look reusable, but they are not, and you don't want your rear axle falling off as you bomb down the highway.

 

[superswamper003]

Nice and tight!

 

[Jacy_dzlguy]

Thanks guys! I did reuse them.. but i was planning on ordering new ones because i was not comfortable with the threads above the original bolt line.. What is the reason for not reusing them? Do they stretch?


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[Jacy_dzlguy]

From here:

View attachment 48183

103 lb-ft, then tighten another 180°.



Like the manual says, be sure to use new u-bolts and nuts every time. They may look reusable, but they are not, and you don't want your rear axle falling off as you bomb down the highway.

Very good info thank you


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[LBZ]

Thanks guys! I did reuse them.. but i was planning on ordering new ones because i was not comfortable with the threads above the original bolt line.. What is the reason for not reusing them? Do they stretch?


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Yes. Among other reasons such as the one you mentioned.

 

[DAVe3283]

Thanks guys! I did reuse them.. but i was planning on ordering new ones because i was not comfortable with the threads above the original bolt line.. What is the reason for not reusing them? Do they stretch?


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Any time you see a torque procedure that includes an angle after some torque spec, it is a torque to yield fastener. That means the bolts are stretched to the point they start to deform, which gives them some "spring", and can help hold a more consistent clamp load across changing temperatures, but it also means the fastener can't be safely reused.

If it is stretched a 2nd time, it can get too thin and break off without warning as temperatures change and the fastener is stressed.

That's how it was explained to me, at least.

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[Jacy_dzlguy]

Whats the best way to set these right? I had a hard time getting them evenly tightened and or the bottom plate sitting flat. Just tighten a little at a time and watch the thread count? I know it sounds simple but i had to redo the old ones a couple times to get them right. New ones should be in tomorrow and i dont want to have to loosen after i have them tight the first time. Thanks