That has to do with the manufacturing process of the crankshaft. It is difficult to cast two of the counterweights in some designs so they add an extra weight to the harmonic balancer, (vibration damper), and to the flywheel, or in your case to the torque converter. Typically you replace an engine with one like the old one but if you want or need to switch from internally to externally balanced, or the other way around, you have to use the correct torque converter for the engine. Just use the harmonic balancer that came with the engine.
Friday, June 29th, 2012 AT 7:32 AM