hi all i have a 72 Skylark Custom. i was working on my car yesterday and i assumed that all customs were nonlimited slip as i was checking the u-joints i rotated one of the wheels. i was suprised to see both rotate one rotated foward the other rotated rearward is this a limited slip. if the custom came with a limited slip differential what kind of gears does it have. the car is a 350/350 i think the car may have had a tow hitch on it at one time.<P>thanks john

Wheels turning opposite directions more than likely indicates an open differential. The way to positively identify whether it is a limited slip or posi rear is to drain the fluid and take the cover off and check for clutch packs in the carrier.<P>Or you could just stomp on it from a stand still. If both wheels spin, it's most likely a limited slip.<P>Ron*

Unfortunately, when you jack up the car and spin one wheel by hand and the other wheel spins the opposite direction, you DEFINATELY have an open (not limited slip) rearend.<P>If both wheels spin the SAME direction, you either have a limited slip rearend or an open rearend with spider gear damage.

Well, let me tell you, I have a 72 Skylark Custom and it's a 10 bolt single whell traction with 3.08's in it. It's the exact same setup as what you have! Go to your nearest Highperformance shop and get a mini spool for it, they only cost $130 which is cheap for any Buick part.