GM-48734 works on HD (Heavy Duty) and SHD (Super Heavy Duty) transfer cases. GM-45380 works on LD (Light Duty) transfer cases. If you're not certain which you have, you should measure the inside diameter of the driveshaft where it slides over the output shaft. Use GM-48734 for 1-5/8" ID. Use GM45380 for 1-3/8" ID.

Used to remove and install the rear output shaft bearing without removing and disassembling the transfer case. Once the driveshaft is removed, the tool is expanded into the bushing, and its forcing screw is tightened against the output shaft to remove the bushing. To install the new bushing, the bushing is placed onto the tool, which is tightened to hold it. The forcing screw is removed from the tool, which is driven with a mallet to seat the bushing into place.