I have a 700r4 that i have never seen run but was told it was good when I bought it with the car. well i built the engine and everything and a new torque converter put it all in and the car only kind of rocks when u put it in gear and push gas pedal. I think my linkage is bad but i don't think that will give it a rocking. can someone help?....i have another tranny but i don't want to swap it out unless i know it is the problem.