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I have a '99 k2500 the only problems really so far is that the intake manifold leaks coolant, it was a common problem with the vortec 5700 and 7400 due to poor design.. I have owned one of the 2000 style trucks.. which would be comparable to a 2000 or newer suburban... they redesigned all motors as you probably know and all transmissions.. if you want to spend more than 7000 I would try to find the newer style the drivetrains overall are much better.. the 6.0L has a much wider powerband and feels comparable to my 7.4L except when towing you can feel a slight difference in torque
 
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