You have to take it loose from the front bearing then pry it out of the trans. Big Job
u joint
I know you will need a pickle fork or ball joint separator for the joints, other than that i think it just unbolts so sockets and wrenches
Most likely it's a CV joint.
could be a contant velocity joint
cv joint
$700-$1200
The rear universal joint on a 1998 Nissan Pathfinder should be replaced when it becomes worn out or broken. Symptoms of a worn joint include rough handling and suspension issues.
Its just above the right inner CV joint, plugged into the bottom/ back side of the engine block. You can only get to it from under the car.
The 1998 Nissan Ultima control arm is held in place by a retaining nut on both ends of the arm. The ball joint can be removed by using a hammer or mallet.
The Nissan Sentra is a Front Wheel Drive(FWD), and as such has no u-joint. Since the engine is transversely(sideways) mounted, there is no driveshaft to connect from the transmission to the axe housing. Instead directly fromt he transmission outdrive there are a pair of halfshafts which go out to the wheels. Each halfshaft has an inner and outter CV joint. CV Means Constant Velocity. They are smoother in operation, and can be turned into a deeper arc then can a u-joint usually. As for why CV joints are not used in place of u-joints everywhere t's a matter of economics. u-joints are MUCH stronger, and cheaper to manufacture, but they will not work in a FWD situation. Rear Wheel Drives drivelines are subjected to ALOT higher torque multiplication then any front wheel drive is capable of. While it's possible to get extreme amounts of horsepower out of those little engines, it's the torque that really breaks things, not the horsepower.
Watch this video on how to replace a u-joint to see if it helps. http://www.myjeepwrangler.com/ Fix-it > u-joint