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Re: Yes...posi or not posi?
Does the carrier have some weird springs and counterweight on a shaft? If so, it has a Gov-Lock(posi). If all you see is four spider gears, it's an open(non-posi) differential. Also keep in mind the Gov-lock carriers can be misleading with the wheel turn test. It acts as an open diff until too much centrifugal force(one wheel spins too fast compared to the other) at which point the "locker" engages. This is also the reason they're referred to as Gov-bombs. They can tend to stay unlocked until one wheel is spinning a bit too fast and then decide to lock, causing catastrophic damage to the carrier and/or axles.
I learned from a dirt track guy that there's a way to modify Gov-locks to work like a LSD(Limited Slip Differential). I did it once and it actually worked quite well, but money is better spent on a quality name brand LSD or locker. I personally prefer the Eaton LSD.
Attached is a photo of a Gov-lock.
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