75w85 gl5 for diff's

What's everyone using? About to 325K and going to drain and fill front and rear diff's. What's everyone using? Best deal I can find locally in at Honda dealer. Local toyota dealer only stocks in bulk and couldn't say for sure it was 75w85.
 
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Red Line Synthetic Oil. 75W90 GL-5 Gear Oil

I've been running Redline 75w90 in my diffs since buying the truck. Over 337,500 miles on it right now and zero issues. Redline also lists the same oil for the transfer case, so I would recommend you do all 3 at the same time to save some time and effort over the long run.

I also use 30k miles as the change interval for all 3.

New washers for all the drain plugs - Amazon.com
 
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I got sold on the Amsoil hype and put their 75W90 HD in front/rear/Tcase. Before that I used both Valvoline and Mobil 75W90, but saw a report where Amsoil did the best in a bunch of different specific tests for gear oil. Mine is a mallcrawler so it probably does'nt matter too much what I use!
 
I use 75w90 in all 3. Whatever synthetic brand is on sale.
I think the rear in mine is a mix of 75w90/80/140 because I had 3 different types in my garage. Front is Walmart Supertech and transfer case is Mobile 1.
 

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