Originally Posted by WD40
That's a scan of the 2004 SVT Supplement.
Is it possible '03 has a different trans fluid requirement than '04 getrag?
My 03 supplement also makes no mention of ATF, and the Ford synth spec indicates 70w90 gear lube. I'd rather not smoke my trans, but want to minimize friction. Royal purp website says 10w40, this is very confusing, but the Ford spec of 70w90 synthetic is hard to ignore.