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 - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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