I have a 1964 chevy c-10 pickup with 402 bbc, I had a th350 behind it and loved the performance. But I couldn't get on the highway (low speed rearend). Would anyone know the gear ratio for this truck,six lug ,standard shift. So I had a 700r4 trans rebuilt. Now I can get on the highway but my performance now is terrible. It won't even spin a tire now. Is there a such thing as too much gear for and o/d trans. But if I change rearends I defeat the purpose of building the 700r4. It shifts to quick and hesitates when it shifts when I mash in it. But in that hesitation my engine revs high. I have tried adjusting the tv cable but no results. Should I have put a stall converter in the trans, or will changing the rearend help. I did have a shift kit put in the 700r4 but I'm just getting poor performance!!