Hi i'm changing to Rev Tech 20/50 Synthetic in the transmition do i need to flush first i think it is running Rev Tech 80W90 at the moment .

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aka DrBagiva, DrBusqvarna, Uncle Knobhead

unless it says you need to on the bottle
i would say no

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Feros Ferio

Make sure whatever you use that it is recomended for wet clutches not all gearoils are.

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.