Post by
fernandoh »
https://forums.nicoclub.com/fernandoh-u153769.html
Thu May 06, 2010 9:30 am
In my 2003 (4WD) a noise (clunk) was related with the U joints at the "propeller" shaft. This is meaning that the up/down movements of the rear axle were not dumpered by the rear U joint, which may have only a small side to side movement. Some few guys tested the U joints and found them tight and OK, but when you hit a bump with engine torque being applied (even without the gas pedal) a noise was produced. I discovered the origin of that clunk hitting the same bump/same speed but in neutral and the car produced no sound at all (so it wasn't the suspenssion items). The braking action was also related with the noise. When the car was about to complete stop you can notice the clunk. In my idea the clunk is when the rear axle changes its relative position with the propeller shaft. I replaced the U joints and cured the problem, at least until today (no Nissan spares anyway), but after some 2000 km the sound is now present again but in a very minor scale. The U joints have Nissan spare clips in different thickness sizes as a way to regulate the U joint movement but I can`t find them here (free play is only of 0,1 mm). Put the truck in neutral and try the bump you choose and see what changes if you do it in gear again.