If it helps to know what you're in for, the Nichols'/Chilton Labor manual shows only 1.5 hours to replace the balancer. (Of course, the same manual shows that a tuneup on a Dodge van 318 should take 3.1 hours plus .6 hours if it has A/C) Your mileage may vary.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags