I have a 2005 Wrangler 4.0, 6 spd., 42000 miles on it. Runs great except once it warms up(slightly) and I let off the gas pedal(down shift or down hills) just put a little back pressure on drive train, it makes a terrible rattle noise. Like a loose bracket chattering some where. Just give it a little gas and it goes away, push in the clutch pedal it goes away...... help!!!!