I have a 2001 F150 4x4 4.6 that Won't shift into 3rd or OD. No warning lights on the dash, and 1, 2 , and Reverse are fine. It has neutraled out on me once, but normally just stays in 2nd. I purchsed the truck this way, and was going to replace the tranny. But after doing some reading it appears this may be electronic. Any ideas??