Posi problem, anyone know how to fix posi rear ends

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Old September 5th, 2009, 07:55 PM
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Posi problem, anyone know how to fix posi rear ends

My limited slip is slipping, when I put the car on the rack the tires will spin opposite directions but if I keep spinning them they eventually both lock up and go the same direction. Anyone know whats wrong and what I could do to fix this. If so were should I get parts. This car is a 1969 Cutlass
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Old September 6th, 2009, 08:22 AM
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Originally Posted by 69OldsCutlassS
My limited slip is slipping, when I put the car on the rack the tires will spin opposite directions but if I keep spinning them they eventually both lock up and go the same direction. Anyone know whats wrong and what I could do to fix this. If so were should I get parts. This car is a 1969 Cutlass
Sounds like your clutch plates are worn. Since these plates must slip on turns, they do wear out. If you have the plate-style unit, they can be replaced. If you have the cone-style unit they cannot and the whole differential housing must be replaced.
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Old September 6th, 2009, 08:29 AM
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Is there any way to tell what style I have without taking it apart? Thanks for the info.
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Old September 6th, 2009, 10:11 AM
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If it's the original rear (12 bolt cover type O) then it has clutches and can be rebuilt.
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Old September 6th, 2009, 10:42 AM
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Originally Posted by joe_padavano
If you have the cone-style unit they cannot and the whole differential housing must be replaced.
*But* a cone posi can be tweeked to significantly extend the life of a street-used unit.
http://oldsmobilewiki.com/index.php/...:Differentials
Which should seriously be considered if one has a 4-pinion 8.2 10-bolt unit ('66-'67).

Last edited by wmachine; September 6th, 2009 at 10:44 AM.
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Old September 9th, 2009, 12:22 PM
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Thanks for the info, I am having hope on getting even tire wear again, anyone know were to get parts for a 69 olds posi rearend
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Old September 9th, 2009, 01:05 PM
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Originally Posted by 69OldsCutlassS
Thanks for the info, I am having hope on getting even tire wear again, anyone know were to get parts for a 69 olds posi rearend
Jim at JD Race http://jdrace.com can help you. He is "monzaz" here on the forum.
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