This past weekend changed the front and rear diff oil in '86 4kcsq from dino juice to Red Line synthetic. Initial results good: 2nd gear synchro's "healed" - no more balkiness in making 1 - 2 shift. Plan to drain it out after about 1K miles and refill with fresh Red Line. Happy so far. markbyrum@erols.com '86 4kcsq '90 100 '95 90cs