After I received the Dana 60 from ESGS, Chaseís shop, he also emailed the flowing charts for gear oil change intervals.
I have also installed a digital temp gauge to monitor the oil temperature.
Here is a copy/pasted the email from Chase.
Dennis, flow the chart and monitor the oil temp on your D60 and use 85w140 Lucas oil
4 Most Important Attributes to Gear Oil
Water separation properties
Temp Reference Chart Ė oil change frequency
170 Deg - 100,000 Miles
200 Deg - 50,000 Miles
220 Deg - 25,000 Miles
240 Deg - 12,000 Miles
260 Deg - 5,000 Miles
260-300 Deg Ė 500-1000 Miles until Temp is controlled
Differential Temp Guide
250-275 Degrees is Normal for new differentials breaking in, do not Tow or take long road trips for first 500 miles as this builds additional heat. 300 degrees is to hot and diff should be allowed to cool.
Normal operating Temp for a differential adequate for vehicle in stock applications 170-220 degrees
Normal operating Temp - Large tires, Undersized Differentials, Towing 200-250 Degrees.
Change your oil frequently your diff will thank you
If water is ever introduced to differential change it immediately, keep in mind that a differential that is hot and then becomes cool will naturally draw in moisture, so it is not always a water crossing that causes moisture contamination, always run a vent to a dry area and insure it breathes easily.
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