whats the difference between the 5r55, 5r55e, 5r55w transmissions? i found where it said i have a 5r55 trans. no e or w or any other letter behind it. its a 2005 ford explorer xlt 4.0l 4x4 v6. i need to find the big wiring harness. jerk sold the trans and box and just cut the wiring harness...