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Viscosity's????

A little confused I know the engine is 20-50 not sure about the trans or the primary viscosity's. I have read same oil for all 3, and I have read 45-140 w I think the tran is same as the engine, and the primary 45-140, does this sound right??? to anyone,
 
Nope!

The engine is 20/50, the primary can be 10/30 or 10/40 but I use the formula+ from the dealer for this. The trans is 75/90 or 75/140 GEAR OIL. Don't use the same oil for all three.
 
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