I did the lines on my car last summer and I would say they were the biggest PITA job I have done so far. I unbolted the motor mounts and tried jacking up the motor with a floor jack with a 2X8 on top and only managed to collapse the oil pan but the motor never moved. I did find out that you can get the old lines out and the new ones in with the motor in place but it is not easy. To me doing the ball joints and brake support rod joints was a breeze by comparrison.

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1983 300SD
200000miles