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Crankshaft Main Bearing Set Fit 81-90 Cherokee CJ7 Jeep 4.0L L6 OHV 12V Crankshaft Main Bearing Set 1996-2004 GMC SONOMA 4Crankshaft Main Bearing Set Fit 81 90 Cherokee CJ7 Jeep 4. 0L L6 OHV 12V. The crankshaft, connecting rods and bearings are extremely important in every engine build, because they convert the reciprocating motion of the pistons into rotational torque. The longer the stroke, the greater the leverage effect and the greater the torque output of the engine. Time will come that your engine bearings will wear out. Always remember, when your engine bearings