3L55

Illustration for article titled 3L55
Illustration for article titled 3L55
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From a snowier clime... 3.55 Posi, $400 delivered by LKQ. I had to pick it up from my friend’s shop. We pulled the cover and the innards look and feel good. 155k miles. What should I fill this with, specifically? 75W90 with a friction modifier?