Dug around in my good book, I have noted if you use Mopar gear oil then they require friction modifier to be added, if you use after market Penrite/Nulon etc then their diff oils don't require friction modifiers, use of 75W85-90 or 140 isn't a real issue, depends on use but must be GL5 grade............ Diffs are the 230RIA made by ZF not DANA, just with or without ELSD .... The old way to check if you have or haven't mofifiers or enough is to do very tight figure 8's in some gravel and listen for the clicks, no clicks all good.. I have always used Penrite/Valvoline or Nulon in my Jeep Diffs no drama and never added extra modifier.
Actually have been thinking if I should have upped mine to 90 due to towing a lot......... but changed more than they reckon so should be all good.
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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