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Old 06-24-2014, 02:37 PM   #1
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Reinforcing C joints vs U joints

Hi all

I recently reinforced my front axle with an inner sleeve, and my C joints with some gussets as well.
My mechanic thinks that this is more than enough and and, with that work done, any U joint reinforcement is completely unnecessary even with the oversized tires.

I just want to play it safe and get second opinions here...
Do you think beefing up the U joints is redundant in this situation, or is it a good precaution?

Thanks!

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Old 06-24-2014, 02:39 PM   #2
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Hi all I recently reinforced my front axle with an inner sleeve, and my C joints with some gussets as well. My mechanic thinks that this is more than enough and and, with that work done, any U joint reinforcement is completely unnecessary even with the oversized tires. I just want to play it safe and get second opinions here... Do you think beefing up the U joints is redundant in this situation, or is it a good precaution? Thanks!
Good question. Do you have the Dana 30 or 44?

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Old 06-24-2014, 02:44 PM   #3
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44
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Old 06-24-2014, 02:48 PM   #4
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I found this article:

http://www.fourwheeler.com/how-to/tr...axles-survive/

If you click the pictures at the end of the article text it gives more details.

Basically says if going higher than 35s then they recommend upgrading the u joints.



Attachment 1235762
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Old 06-24-2014, 02:58 PM   #5
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I'm using 35s... so it looks like I'll be OK with holding steady for now.
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Old 06-24-2014, 03:04 PM   #6
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I'm using 35s... so it looks like I'll be OK with holding steady for now.
Yep, you're already better off having the 44 and on 35s, you should be good to go with just the sleeves and gussets.

Looks like it's an "all systems go" for you!
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Old 06-24-2014, 03:07 PM   #7
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^^

Thanks for your help!
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Old 06-24-2014, 03:09 PM   #8
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^^ Thanks for your help!
You're welcome! Happy wheeling
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Old 06-24-2014, 04:07 PM   #9
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beefy u-joints(like a CTM) do nothing when you spit the caps and tear the ears off the axle shafts. Going to a full circle clip u-joint will help the cap spitting or you can put a spot weld on the cap to keep it on place.
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Old 06-24-2014, 04:38 PM   #10
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Consider the U-Joints to be the sacrificial link. You don't necessarily want the U-Joint to survive and have the axle shaft break. Much easier to change out the u-joint than the axle shaft in the field.

Or so I've been told.
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Old 06-24-2014, 05:25 PM   #11
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beefy u-joints(like a CTM) do nothing when you spit the caps and tear the ears off the axle shafts. Going to a full circle clip u-joint will help the cap spitting or you can put a spot weld on the cap to keep it on place.
Been there lol


Get some spicer ujoints. They've been doing me good so far
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Old 06-24-2014, 06:16 PM   #12
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Consider the U-Joints to be the sacrificial link. You don't necessarily want the U-Joint to survive and have the axle shaft break. Much easier to change out the u-joint than the axle shaft in the field.

Or so I've been told.
MOST of the time its not the u-joint that breaks, at least not initially. The cap comes out and then its all down hill from there. MAYBE only the joint breaks but usually you tear the ears off the axle shaft. Or a combination of both. Ive also seen the ears on the axle shaft start to stretch, which leads to throwing caps, which leads to ears breaking off and u-joints being destroyed.

Take care of the caps coming out and your shafts and joints will last A LOT longer.

That is the biggest reason to change to different u-joints so you get the full circle cap's so they cant come out(or not nearly as easily). Or get a spot weld placed on the factory caps so they cant come out.
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Old 06-24-2014, 07:15 PM   #13
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MOST of the time its not the u-joint that breaks, at least not initially. The cap comes out and then its all down hill from there. MAYBE only the joint breaks but usually you tear the ears off the axle shaft. Or a combination of both. Ive also seen the ears on the axle shaft start to stretch, which leads to throwing caps, which leads to ears breaking off and u-joints being destroyed. Take care of the caps coming out and your shafts and joints will last A LOT longer. That is the biggest reason to change to different u-joints so you get the full circle cap's so they cant come out(or not nearly as easily). Or get a spot weld placed on the factory caps so they cant come out.
This might be a dumb question but what actually causes the caps to blow? Is it sheer stress or a build up of pressure?
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Old 06-24-2014, 09:52 PM   #14
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This might be a dumb question but what actually causes the caps to blow? Is it sheer stress or a build up of pressure?
Well the stock joints have a clip on them, but not a full circle clip, just a c clip that doesnt go all the way around. They work themselves loose, fall off, then the cap doesnt have anything holding it from flying out of the axle shaft. Then centrifugal force works the cap out of the end of the axle shaft ears and its all down hill from there.

People dont check their u-joints often enough for this stuff either because its a pain in the ass to check.

So a full c-clip conversion or a tac weld on the top of the caps to secure them to the axle shaft ears takes care of a lot of problems.
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Old 06-24-2014, 10:04 PM   #15
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Well the stock joints have a clip on them, but not a full circle clip, just a c clip that doesnt go all the way around. They work themselves loose, fall off, then the cap doesnt have anything holding it from flying out of the axle shaft. Then centrifugal force works the cap out of the end of the axle shaft ears and its all down hill from there. People dont check their u-joints often enough for this stuff either because its a pain in the ass to check. So a full c-clip conversion or a tac weld on the top of the caps to secure them to the axle shaft ears takes care of a lot of problems.
Ah, ok. Thanks for explaining that. Are there any particular scenarios that would cause the onset of this to happen sooner? It seems like if it's centrifugal forces it might have something to do with wheel spin while under duress? I'm trying to learn as much as I can but google hasn't been giving me good answers! LoL

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