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Old 01-10-2008, 03:36 PM
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how to tell if its a posi

If you have a rearend assy out of a car laying on the floor is there a way to tell if it's a posi without pulling the cover? No tags or anything like that on it
thanks

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Old 01-10-2008, 04:26 PM
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put it on stands and spin one wheel, the other wheel should go in the same direction, if is a posi. if its not it will spin opposite of the spun wheel.
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Old 01-10-2008, 04:47 PM
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how to tell if its a posi

stand method works
you can hold the yoke and if the wheels turn opposite
direction easy ,it's no posi
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Old 01-10-2008, 06:00 PM
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A Big Thank You!!!! :d :d :d
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Old 01-10-2008, 07:13 PM
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If your buying, pull the cover or third member to make sure your really buying a posi and not a POS with welded spider gears.
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Old 01-12-2008, 01:23 PM
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If when you say "posi" you mean a GM Posi-Traction® differential made by Eaton then yes you can do the spin the wheel test.

If when you say "posi" you mean a clutch pack type limited slip differential then yes you can do the spin the wheel test.

If when you say "posi" you mean any type of traction adding differential then no you can't always do the spin the wheel test. For example a GM Gov-Lock® (made by Eaton), Trutrac® (now owned by Eaton but designed by TracTech), and Torsen® (made by Zexel-Gleason and used in some late model F-bodies and Mustangs) will all act like an open differential with the spin the wheel test.

And people wonder why I don't like the use of the word "posi"

Last edited by Triaged; 01-12-2008 at 01:31 PM.
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Old 01-12-2008, 03:54 PM
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I guess best bet is to pull the cover
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Old 01-12-2008, 04:05 PM
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Quote:
If when you say "posi" you mean any type of traction adding differential then no you can't always do the spin the wheel test. For example a GM Gov-Lock® (made by Eaton), Trutrac® (now owned by Eaton but designed by TracTech), and Torsen® (made by Zexel-Gleason and used in some late model F-bodies and Mustangs) will all act like an open differential with the spin the wheel test.
you are confusing the poor guy
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Old 01-12-2008, 04:16 PM
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Quote:
Originally Posted by yragat
I guess best bet is to pull the cover
Quote:
Originally Posted by 1drwgn
you are confusing the poor guy
He did come to the proper conclusion. It is always best to pull the cover off and find out for sure what gears are in it, what diff is in it, and what condition it is all in. If it is out of the car you don't even have to drain the oil to pull the cover off - just point the pinion down.
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Old 01-19-2008, 05:44 PM
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How To Tell If Its Posi

If I'm buying, I ask to pull the cover to confirm what it is. You can check ratio and type at the same time. If its what you want, then buy a gasket, cheap insurance. If they won't let you pull it, must be something wrong. M2C
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