Sprocket, just put a Sharpie line on the input shaft, and another on the output. Both trans have the same .62, the difference is first gear, so... Put trans in 1st. Rotate the input once. Look at the output, you'll figure out which version it is easily by how much the output turns. Slightly less than 3? 2.97 1st gear, 400ft-lb rating. 3.3 turns: 3.36 first, 350ft-lb rating.