The 3.31's are considered "highway gears" because they would allow lower engine RPM on the highway. This was especially important when we had three speed automatics. 373's are better for lower end pulling and may sacrifice some fuel economy at higher RPM's. Limited slip means both rear axles are locked together unless you turn the vehicle. Since the rear wheels cannot go around the turn at the same speed, the outer wheel must spin faster so the pressure "unlocks" the clutches to allow for a limited slip which depends on the degree of the turn. Turning into a driveway virtually unlocks the clutches and driving on a highway cloverleaf allows for less slippage. Open differentials do not have this locking feature and therefore only one wheel spins by design. Hope this helps. Gerard
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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