I changed my all the fluids in my car a few months ago, I imagine the oil in the tranmission was stock (car had 100k miles on it) and with the new Mobil 1 fluid the transmission is noticeably notchier.
When I went in to the parts store they only gave me gear oil, but now that I look in the book it calls for a mixture of oil and ATF.
What gives? What should be in the tranny? Does it need atf?