I actually changed my transmission/front differential fluid yesterday with full synthetic 75w-90 because of this thread reminder. It was easier then I expected, easier then changing the motor oil, and I bet it hasn't been done in the 13 year 160,000 mile life of the car so it feels much better, but then again we will see today after work as it's sitting all day with a high of 15°F. Overnight it sits in a garage that usually stays above or around freezing so this morning wasn't a good test.
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