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4000cs q newbie



Hi all, 
Being new to this list, I thought I'd say hello. I have a few questions
I hope you can answer.

I just picked up a 86 4000cs q for 600 bucks. It's what I would call "a
project car", as I don't expect to see it registered anytime soon. It
needs a new drivers door and lots of TLC, but it also has some
mechanical problems that I need some input on:

The car make quite a racket when you drive above, say, 20mph. It sounds
like a whump-whump-whump, and is quite clear inside the car, but not at
all outside. We thought it might be a problem with the 4wd, so we put
the car up on blocks. The rear wheels did not turn when I put the car in
gear! This car is perm 4wd, correct? When I locked either the center or
rear differential, the wheels would turn. Anyone have any ideas? Is this
normal (maybe something to do with LSD)? Again, I'm new to this, so any
hints would be well appreciated.

Finally, I need a manual! Does anyone have one for sale, or can someone
tell me how good the Audi shop manuals are? I was going to get a
Bentley, but was told they were out of print, and now I want to know if
the Audi manual are any good (my Toyota MR2 manuals are great).   

Thanks for your help! 
Paul
=)
86 4000cs Quattro, 120k red leather