Hello Im having the vibration hum issue on my 2005 Hse. Yes the revs are dropping with the noise. I read all post pointing towards the torque converter. I purchased a remanufactured unit from torqueconverter1.com. My questions is....Should I try a full fluid flush(11 liters) or half fluid flush(5l )with new filter and gasket. I looked underneath the pan had a lube guard sticker on it. Im not sure if it was serviced with the wrong fluid type and lubeguard additive. Or should I just drop transmission and install torque converter and then do the full or half flush. I just purchased truck two weeks ago. Also Is this a home diy job in my garage without a lift? I worked on my own vehicles for the most part. Thanks in advance..