Over time all internal engine wear surfaces become worn. This is true for crankshaft journals, connecting rods, camshaft lobes, piston rings, bearings, etc. When rebuilding a worn out engine you'll need to replace them all in order to regain the engine's original performance. And, let's face it, Jeep's need all the power we can get. Omix-ADA offers new high quality replacement engine parts to get your Jeep back on the road. This replacement main bearing set fits 93-98 Grand Cherokee ZJ models equipped with 5.2 liter engines with 0.020-inch under size crank. Replaces OE 4397776K.020