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Someone else may chime in but I have always heard it is a bad idea to flush an automatic transmission. It tends to loosen stuff up that ends up in places you don't want and causes failures. Just drain it and the diffy and replace the fluids.
I personally use Valvoline, but as long as the oil is a full synthetic and Dexos rated you should be alright.
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The Original Farm Rat
2011 1LS M6 Victory Red
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1967 Coupe Green and White
1969 SS 396 Hugger Orange
1969 Z/28 All original White with deluxe interior
1970 RS Blue
1978 Coupe Fugly Green
1978 WS-6 Trans-Am Factory 4 speed
1985 IROC-Z Red
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