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Not at all hard. Need good jack and stands: be safe! After that, unbolt drive shaft at front and back ends (4 bolts each), unbolt the flex disk bracket (2 bolts), carefully pull entire drive shaft out through tunnel. Be careful not to separate front and rear halves of the drive shaft!
With drive shaft out of car, mark the two halves so you can orient them correctly when you put halves back together. Get it wrong and you can unbalance your drive shaft -- noisy. Replace the flex disk, put drive shaft halves together in proper orientation, and put the whole mess back into the car. Get the torque specs for the bolts. 90 minutes max with no stuck bolts (less if you've done it before, more if the bolts don't cooperate).
If you have even a hint of driveline noise at freeway speeds, get your drive shaft serviced (replace U-joints and rebalance shaft).
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-- Bruce / '82 244 (315k miles!), '86 745, '87 760Ti, '94 854
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