I to use 5w110 syn. gear oil in all my rear ends & manual trans. It makes them shift smoother & if you ever drive them in weather thats a bit colder outside you'll find that they will shift much easier to shift when it's cold. You don't have to wait for it to warm up to shift easy. With the syn. fluid I always use the posi additive if it's a posi. But if it isn't you don't have to use it. To find out when it's off you will be able to see the extra parts for the posi but if it's up in the air all you need to do is spin the wheels & if both wheels go the same direction then it's a posi if one turns & the other either goes the opposite direction or does turn at all then it's an open rear end. As the the last poster said though, being it was a custom s & a 6 cyl, weel most likely not a posi
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