My truck has an auto Trans and I'm swap the zf6 into it. The manual trucks had different weighted flywheels. So south bend needs mine to weight and balance the flywheel properly. But I drive the truck almost everyday so didn't want the truck down for a long time, however I bought a lmm flywheel that I was hoping to send to sbc in place of mine. That's where the question cones into play of are they weighted the same