| Amsoil is perfectly compatable with both conventional and synthetic lubes. Synthetic would be preferred for your transmission, but for now you will be fine.
For the diffs, again, you are fine to mix them, but better to change the fluid. Its good to change the fluid and clean up the magnets inside the diffs anyways.
I would not trust a fram on my lawnmower. Never. Thats an expensive transmission in an expensive truck, why not spend a few more dollars and give it the quality filter it deserves? I severice Allisons here with the Donalson Part Number P550606
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