I'm not 100% sure but I recall the NV3550 was in the Liberty through 2004. 2005 was the change over...I don't remember what it was replaced with.
$500 is a good for the whole rig. You can try and sell some parts and then scrap the rest. $100-200 in scrap I bet.
I just paid $350 for a M5ODR5 out of a 2000 F150
Tim