OK, I'm still baffled. My 3 speed 2.77 finally won't shift out of first. I bought the 3.03 (3 speed) but can't find the other parts. So trying for the T5. Which T5 will fit my 66 I 200. I'm assuming that I have the stock rear end so I don't know the gear ratio. I have seen that the 79 to 93 will fit, but I don't know which one. They have them that come from 4 cyl., 6 cyl, 8 etc. 5.0.? Then you have the first gear ratio's of 2.95, 3.35 and 3.97. Can someone please help me narrow it down to what transmission I need. I kind of need for someone to be very specific on what I need. Thank you in advanced.