guys, I need some help please! I have a 1986 4x4 with a auto trans. What trans is it a AW4 or a Torque flite A904? I can not find any info on a 1986 other than it was the only year for the chevy 2.8v6 and the AW4 started in 1987 and the A904 was behind the 2.5. anything would help Jeff