Help with 8.8 rear

[1990MustangLX50]

ive got an 8.8 rear sitting on jack stands. If I turn a wheel both sides turn. If I hold the pinion yoke neither wheel will turn, I thought that with the yoke held 1 wheel should got one way and the other wheel the other way. Am i crazy or is something wrong with my rear?

thanks

 

[BK_CAULEY]

could be a spool or someone might have wlded the gears, but yea when i have had my car on the jackstands and turned one wheel the other went the other way

 

[1990MustangLX50]

It had some rust inside but I didnt think it was an issue. Guess I need to recheck some things.

 

[1cobra4u]

If its positrack they will both turn the same way

 

[PUNISHER RACING]

if it was an open diff it would!

 

[trbkrb]

All the 8.8s with traction loc I've touched both wheels turn the same way when you turn one. On an open dif they turn the opposite ways.

 

[NKau]

These guys are correct; with a PROPERLY FUNCTIONING posi rear end, both wheels should turn the same way. I have seen posi's that were so worn out, that the wheels would spin the opposite way (typical of an open diff). No need to hold onto the yoke either; let it spin freely to test it. If it's a posi, it sounds like you'll be rebuilding it either way.