There is a grinding noise in the rear end

Your throwout bearing in your clutch is going out. More of a rattling grind.
Replace it ASAP before you end up replacing the whole clutch.
Hope this helps Mike

May be broken snap ring which keeps gears in proper position, but since you posted this in the wrong category, don't expect many answers.

A noise in neutral that goes when the clutch is disengaged indicates a front input shaft bearing in the gear box . When the clutch is out that shaft is spinning along with the cluster shaft in the gear box. When the clutch is in that shaft stops (to engage first gear) and the bearing is no longer working.. It normally means a box out job.

cluch plate to be replaced, flaw in materail caused plate to shatter!

Does this happen while moving? How much travel is on the clutch pedal before it 'Bites'

What?! Really! The noise goes when the clutch pedal is depressed! So the noise goes when the release bearing (throw-out bearing) is engage? So how would that be a release bearing/clutch problem? If it didn't make a noise until the clutch pedal was depressed, it would be the release bearing! In other words its the input shaft bearing and/or counter shaft bearing in the gearbox. Stop giving people bad advice

Hi,input bearing on gearbox,50.00 from mitsy.A doddle to repair

you have 2 choices either the clutch is not disengageing properly or the gearbox is shot.put the car in first,put the clutch pedal down, then start the car and if its trying to pull away before you take you foot of the clutch you have you answer....if its the clutch cable you can adjust it..

This depends as dose it do it when cold or hot.
2nd when you push in pedal and put in gear dose it go in clean or hard to select 3rd can you hear a grinding noise when pushing in pedal and noise goes
when you take you foot off the clutch pedal IF so then its the thrust bearing on clutch REPLACE ALL .4th if you push in clutch pedal and select a gear and let the clutch out if drive right out (replace)

You should have a heavy return spring under the dash on the pedal and a lighter one on the clutch linkage with one end hooking beside the rod pushing onto the clutch pivot. (some have a small hole for the spring) (The clutch pivot is the part going into the bell housing holding the bearing) and the other end hooking on something that will keep the pivot and bearing away from the clutch when you are not pushing the clutch pedal.
TIP. When sitting stopped for any length of time with the engine running......(and more important with heavy duty clutches)....put the vehicle in neutral and keep your foot OFF the clutch.