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Post by wally324 on Jan 10, 2015 11:53:07 GMT -5
Seems I read somewhere that you can easily identify a Posi Rear End by jacking up the rear end, rotating the driveshaft and if the wheels both turn the same direction it's a Posi. Is this true or not?
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Post by shane on Jan 10, 2015 15:03:07 GMT -5
The way u described it tends to be true. The best way is to take the cover off and then you can identify your gear ratio also.
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Post by wally324 on Jan 10, 2015 15:25:15 GMT -5
Thanks Shane, I don't want to start tearing it apart right now. I just wanted to get an idea whether it was Posi or not.
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Post by jims442 on Jan 10, 2015 19:35:20 GMT -5
usually spin one tire if one goes one way and the other goes another way should mean not posi
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Post by joepadavano on Jan 12, 2015 11:23:10 GMT -5
The answer is, it depends. If the "posi" is an Eaton unit as used in the later model GM trucks, it will act like an open rear until one wheel is spinning fast enough for centrifugal force to engage the locking mechanism. Also, a worn clutch-type posi (technically, anti-spin) axle can also spin the tires in opposite direction.
The easy test for an anti-spin in good condition is to jack both rear tires off the ground. With the trans in PARK (or in gear for a manual) and e-brake released, try spinning one tire by hand. If the other tire turns the other way, it's open, or Eaton, or worn. If you can't spin the tire, it's a clutch-style anti-spin and working properly.
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Post by wally324 on Jan 13, 2015 9:16:26 GMT -5
Bummer, I just dropped the driveshaft the other night. The car is on jacks so all I have to do is figure out how I can lock the input to the rear end. Maybe a pipe held to the yoke by the U-bolts will do it. I would like to confirm it rather than having to pull the rear end apart.
Thanks, Wally
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