B bamaboy60p New member Aug 26, 2009 #1 1976 ford f150 c6 transmission. when i first drive it, it changes at 35mph. then, it shifts good the rest of the time. what causes this. i just had my transmission rebuilt
1976 ford f150 c6 transmission. when i first drive it, it changes at 35mph. then, it shifts good the rest of the time. what causes this. i just had my transmission rebuilt