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Thanks both for your input. Here is some additional reading if anyone like to geek out on this stuff.
https://vpracingfuels.com/tech-talk-insider-articles/gl4-vs-gl5-gear-oil/
Just reviving this old thread rather than starting a new. It has been three years since I changed my differential and hub fluid, so it is time. I used Valvoline HD Synthetic 75W-90 which is on the Meritor Approved list (TP-9539) which also list the API rating as GL-5. I read in the TM that a...