The Cummins 3906454 is a genuine OEM crankshaft thrust bearing designed for Cummins 3.9L and 5.9L B Series engines, including models like 4B, 6B, 4BT, 6BT, 4BTA, and 6BTA. This critical engine component manages crankshaft end play, ensuring proper alignment and reducing wear. With dimensions of 88.9 mm length, 88.9 mm width, and 12.7 mm height, and a weight of 0.036 kg, it is manufactured to Cummins' stringent quality standards for reliable performance. It cross-references with Case IH J906454 and New Holland 87408803, 87682894, J906454.