you re rear axle i just replaced mine it probably the front pinion bearing
A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
A seized gear can cause a knocking sound on a 1987 Nissan 5 speed transmission. A blown gasket can also cause this sound.
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the cause of this is probably a bad u joint
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
change fuel pump
check CV joints
low oil and a loose piston skirt
Most common cause would be a loose brake caliper mounting bolts.
Worn Ball Joint
sounds like you ac compressor is about to crap out.
it might be a bent piton rod if you or water or somthing into the engine