What type of rear end does my 98 Jeep Grand Cherokee Laredo have?

A 1998 Jeep Grand Cherokee Laredo could have either a Dana 35 or a Dana 44a rear axle. There's no way to know for sure without looking at the axle itself (usually there's a tag on the differential cover).

The Dana 35 is more common and less durable, while the Dana 44a is stronger and more desirable, especially for off-roading. You can check your vehicle's identification number (VIN) against a parts database or your owner's manual (if you have it), but even that's not guaranteed to be perfectly accurate. The best way is to check the differential cover.