Would it be possible to figure out the difference between a w5m31 and a w5m33 in a percentage. My Mitsubishi manual states the final reduction as 4.92915=w5m33 and 5.208=w5m31. Then change two tires to compensate for different final reduction. If nothing else get it close enough to drive the car without worry about locking the the center differential to the repair shop one more time. Matt