Blew a halfshaft & wheel bearing on my 2002 A6 2.7T Quattro & for some odd reason after replacing both (torqued all to spec) it only moves in reverse. Acts like you're about to boost launch in drive and moves very slightly. I jacked the whole car up and got it as level as possible to see if I'm low on trans fluid - started the car to warm up the trans - and now I'm hearing an odd ticking/slight clunk noise that sounds like is coming from the transmission/front end. Could this be a blown transfer case? Bad trans? And help would be GREATLY appreciated.

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