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What could cause a massive u-joint failure??

85mudblazin

85mudblazin

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Tonight I was stopped at a stop sign about to turn right and when I pushed the gas my blazer kindove lurched and a loud bang occured, I jump out look under the truck and there is no driveshaft I turn around and there it is a about 6ft away I look at it and both u-joints were broke off at the caps, Luckly I was about a 1/4 mile away from my house so I drove home in 4wd with tranny fluid pooring out, WHAT COULD HAVE CAUSED THIS?????
Next question is what u-joint is in a rear driveshaft out of a 1985 blazer with a 208 t-case and a 10b rear??
Much thanks.
-Chris
P.S: I will have carnage pics tomorrow!!!
 
Catastrophic failure is caused 99.999999999999999% of the time by the yokes binding.

2-3011 is the part number you're looking for, 2-3012 for greasable through the cap if desired.
 
[ QUOTE ]
Catastrophic failure is caused 99.999999999999999% of the time by the yokes binding.

2-3011 is the part number you're looking for, 2-3012 for greasable through the cap if desired.

[/ QUOTE ]



Is the other 0.000000000000001% from popping wheelies?
 
What would cause the yoke to bind?? I have herd a little noise during sstoping and starting you think this had something to do with it?? Could there have been a crack in a u-joint and it just all of a sudden gave out??
Thanks
-Chris
 
[ QUOTE ]
[ QUOTE ]
Catastrophic failure is caused 99.999999999999999% of the time by the yokes binding.

2-3011 is the part number you're looking for, 2-3012 for greasable through the cap if desired.

[/ QUOTE ]



Is the other 0.000000000000001% from popping wheelies?

[/ QUOTE ]

That other minor percentage is the people that actually have enough torque to make a u joint that is not binding fail, which is pretty rare without a severe shock load.
 
[ QUOTE ]
Spicer

[/ QUOTE ]

Ya, what he said /forums/images/graemlins/thumb.gif
 
You need to find a parts store or driveline store that carries Spicer. Not all parts stores can get them. Even less stock them.

Harley
 
They may not be able to get spicer, you can always ask them though. They should be able to cross reference the number that Tim gave you.
 
First off; have you been having problems with breaking u-joints or is this the first time?

Second; is the original driveline that came with your truck?

Thirdly; what modifications have you done to your truck? Your driveline angles may be wrong.

Fourthly; you may have damaged your driveline in some way prior to this incident and it finally gave out.

If I were you, I would take the driveline into a shop and have it checked out for damage and possibly have it balanced.

Before you do however, I would take measurements to make sure your driveline is the correct length. Here is a site; http://www.dennysdriveshaft.com/html/how_to_measure.html


The easiest thing to do is just replace your u-joints; however you still need to find out why they broke in the first place. The above is all just for preventive measures.
/forums/images/graemlins/peace.gif
 
This is the first time this has ever happened as you can tell by my lack of knowledge, I have a 4" lift and my angles were off and I had a vibration so I put shims in and that solved everything so my angles are good, so the only thing that I can think of is that the u-joint was damaged sometime and then it just gave out.
Thanks
-Chris
 
I am saving up to buy a HAD cv shaft so I will prolly just replace the u-joints and hopefully they will last about a month, I dont see why they wouldnt, they have lasted for about 1 year which is when I had them replaced when I bought it.
 
[ QUOTE ]
Catastrophic failure is caused 99.999999999999999% of the time by the yokes binding.

[/ QUOTE ]

that doesn't sound right to me for some reason /forums/images/graemlins/thinking.gif

The three I lost had nothing to do with bind, and what about operating angle and wear on the needle bearings? Usually something that happens all the sudded is far from sudden at all and probably had signs that it was getting worn or was damaged before it failed. Most people interpret these things as all the sudden but loud stereos or not paying attention to the sounds your truck makes might have something to do with it /forums/images/graemlins/dunno.gif /forums/images/graemlins/deal.gif
 
[ QUOTE ]
This is the first time this has ever happened as you can tell by my lack of knowledge, I have a 4" lift and my angles were off and I had a vibration so I put shims in and that solved everything so my angles are good, so the only thing that I can think of is that the u-joint was damaged sometime and then it just gave out.
Thanks
-Chris

[/ QUOTE ]
Did you also lower the t-case down when you did that?
 
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