vs clubsport knock and rattle sound from rear

[mr_clubby96]

hey guys i took my car out for a cruze and noticed this anoying rattling knock sound it seems to do it very rare on back off throttle but mainly u can heard it on bumpy roads and speed humps my diff has been checked every thing is new also new uni joints in tail shaft have been replaced and also and clutch is also new

will this problem be cause my 1st gear to go in tight while im stopt then taking off cause im noticing that problem aswell cheer guys

its a 5speed manuel

[Wagon_Wheel]

Shocks rooted? Worn bushes? Driveshafts have a bit of play in them? Are you wheel nuts tight? I know that seems stupid, but its happened to me a few times on both of my cars when after a while the nuts will loosen themselves and start making a rattling sound when you back off, and it gets worse and worse.
Could be a million different things though.
If the noise is coming from the rear it wont be your gearbox.

[mr_clubby96]

shocks and bushes and springs are all brand new n heavy duty
do u think i should check if the rear wheels
are tight

[mr_clubby96]

checked em to be sure it aint the wheels i got told from 1 mechanic could be my rear wheel bearings off the axal