Transmission problems are serious...and if it isn't already, the noise is a warning that it will be very soon. There are any number of things it can be and it must be inspected quickly. (Of course one possibility to hope for...it isn't really the tranny but something like the exhaust rattling against it). Do not delay.
if your going over 2nd gear the gearbox will surely fall out
Sounds like the transmission
Check the transmission fluid level.
There can be several things that will an automatic transmission not to work properly. The most common cause is a lack of transmission fluid. Broken shifting linkage can also cause the problem.
Your transmission needs to be rebuilt ... although - once - I "fixed" that problem by draining & refilling my trany.
On the gearbox.
if an automatic transmission is grinding in reverse it is probably an internal failure. The car will probably need a good mechanic who specializes in transmissions to look at it to be sure. I have seen some cars with a simple linkage problem do this...but its unlikely.
u can get your reverse lamp wiring from fuse box there..check it out
he tansmission is gonne and needs to be replaced
If you have an automatic transmission, it probably has a forward clutch/band problem.
Sounds like your gearbox or clutch may have messed up. Check your clutch and gearbox fluids and then secondly check the clutch plates and gearbox.
If you have an automatic transmission then either the linkage is fouled up or you got a internal problem. That's 100 vrs about 3000 dollars.