The timing chain cassette problems with the 4.0 SOHC were starting to taper off by 03 but they're no picnic to fix if they fail. I'd rather possibly deal with the cassettes once than deal with the extra maintenance every year to keep the rear disc brakes functional. An 03 also does not have traction control, another plus. The Germans caused the timing cassette problem when they decided to convert the 4.0 ohv to sohc, they didn't want to have 2 mirror image cylinder head castings that would have allowed both chains to be in the front- or even both cams driven by a single chain. They stuck a balance shaft where the cam used to live and drove it by a chain from the crank, drove the left cam off the front of the balance shaft, drove the right cam off the rear shaft, and then added a 4th chain to drive the oil pump off the crank. Typical Rube Goldberg/German engineering-overcomplicated and unnecessary. They had finally fixed all the oil leak problems they had built into the 4.0 ohv by using cheap gaskets, I can't believe they couldn't have increased the power while staying ohv cheaper and simpler with a little more compression and a little better breathing. Cheap and simple are foreign concepts to the Germans. A perfect example of cheap and simple would be the 300 six.