Hey just drove my car before and i notice a very low noise coming from there rear of the car, as i kept driving it got worse and ended up like a loud knocking that made the car rattle..after i pulled over i got a mate to push it forward and back the noise change when i pushed it back and then front,there is no whining noise. he think its either the drive shaft, tail shaft or diff....what are the main symptoms for a faulty diff?

cheers Tommy

 

It's probably going to be a bad diff. The other parts, while they break... don't break often unless the car is boosted and drag launching.

I've sheared pinion gear teeth off two differentials. One was cryo'd.

 

thanks ill jack the rear up tomorrow and check where the noise is actually coming from, then drain the diff fluid to be certain

 

hey i listened for the sound after i jacked the rear up and it seems to come from the tailshaft, if i hold my hand there it seems to go away....is the tailshaft supposed to have any freeplay like moving forward or back?

 

Just drained the diff fluid and there is shaved metal pieces on the drain bolt but not anywhere else, oil was very thick and slighty cloudy....I moved the wheels again and the clicking noise seems to have dissapeared, what should i try next?

 

Did you actually find metal savings (bits) or is it a silver metllic sludge?

 

very small metal savings, not a lot only around the bolt...i refilled the diff and the clunking sound came back...i push the tailshaft towards the diff and the sound goes away....what tools are used to remove tailshaft and diff?

 

does it sound like this? if it does than its your diff.

 

dont know what speed its doin there, but honestly doesnt sound like that...more space in between clicks and mines a little louder but im not sure if thats based on speed

 

can you make a sound clip or video? it would really help.