posi or open?

[calpolymustang]

how do i test a rear end for posi/lim.slip/open at the junk yard?

i found a 9" thats 55" drum plate to drum plate (~56" housing). i counted 3.5 pinion turns for one axel turn, but that was without holding the other end. when i turned one axel, the other side turned the same direction. the guy wants $220 for the setup, but i dont want to buy it unless its worth the trouble of hauling home. i already have a 31-spline galaxy 9" i can shorten

 

[Fostang]

if they both spins in the same direction it's got the posi or some f'd up spider gears. LOL

Good luck.

 

[bnickel]

if both axles turn the same direction it is indeed a posi, barring any mechanical failures in the diff itself

 

[SandSprite]

Where's this one at? Is it 55" backing plate to backing plate? If so that will be too wide. 65-66 are 52.25" backing plate to backing plate and 57.25" drum face to drum face. What's wrong with that 8"?

The way i saw that my 9" was a LSD first was by the tag. The tag will have a '.' for the ratio, i.e. 3.50. A trac-lock will have an 'L', i.e. 3L50.
As mentioned, spinning one side and having the other side go the same way indicates a LSD too.