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Post Info TOPIC: 8.5 GM POSI Clutches ?


Poncho Master!

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8.5 GM POSI Clutches ?


Took my posi all apart and was wondering : How do you know the clutch discs are worned out ?



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Uber Guru

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Generally, new plates have a surface material that resemble exaggerated sharp mountain peaks....... So, if they are really worn smooth, and they will over time but not shiny smooth, they are toast.

 Also, there is a torque spec of about 45psi with the vehicle in park/reverse with a standard and one wheel sitting on the ground to break the posi loose. I will recheck the specs.



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Vincent Jr.



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Thanks Vince, I will post pics after I clean the discs, the posi is out of the car...



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Poncho Master!

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Here are some pics of my DESTROYED posi unit including a cracked spider gear, now I can see the wear on the clutches comparing it to the tangs, elongated pin hole from wobbly retaining pin ! lol I've seen 3 broken small pin bolts over the years so far, I wonder why ? Weak point for these posis ???  



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Uber Guru

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Most of the breakage come from people ramming their cars in R and D when they are stuck... Most instances, the spiders will weld themselves to the cross shaft pin, try to turn as a unit and finally breaking the bolt. The bolt itself, I believe, is a grade 8... 

 Was the pin and the inner surfaces of the spiders scored and worn??

935923?AWSAccessKeyId=1XXJBWHKN0QBQS6TGPG2&Expires=1307577600&Signature=9Smz%2F7wcR7f36i2vrX%2Br2tvOGfk%3D   935924?AWSAccessKeyId=1XXJBWHKN0QBQS6TGPG2&Expires=1307577600&Signature=rwYF1ItsaMcTRZlqrJWZfr9qcuY%3D

 

 At least you can see what I mean about "good" and bad clutches...

 

935925?AWSAccessKeyId=1XXJBWHKN0QBQS6TGPG2&Expires=1307577600&Signature=fI%2Fxx8j63je2W1LaGBylxUcxSwA%3D



-- Edited by 67Poncho on Wednesday 25th of May 2011 10:33:30 PM

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Vincent Jr.



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Yes the pin and the inside of the gear were worned pretty bad...



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