ls1 rear end is the same except the brakes and rear diff wich hasnt proven to me its stronger. Plus you would have to swap the brakes over anyway. so LT1 rear with a higher(numerically) gear would be best. the highest gears GM used in the A4's was 3.23 im guessing you dont have them as they came in special packages in the LT1. SS/WS6 Mostly. So get a 3.23 or 3.42 rear end. BUT with getting a used rear end you run the same risk of That posi being on the way out too. just some food for thought.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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