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This a toughy....So it grinds when you hit the brakes with the engine rpm around 2200-2400, or just engine braking at that rpm causes the noise? Tend to think it's not transmission related if your in gear and it makes a grinding sound. Could be just the engines natural resonance in that rpm range when slowing down? Need a bit more information: is the engine warm? Do you feel a vibration/hum while driving? What oil are you using? If your in neutral and coasting what does the engine sound like if you maintained the rpm around 2200-2400 and idle speed?
Edit: what does the grind sound like? Low rumble, high pitched scratchy sound, marble in a tin an sound? Etc.
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