If you have normal selection of PARK and "L" (both ends of the selector range) then it's unlikely to be a linkage problem. If you get TOP gear in "D" then the problem will be with the rear band or it's operating servo. The servo is prone to breaking, cracking, or coming loose, and the seal can fail as well. You can see the servo if you drop the sump, and you should be able to see any problems. If you want to confirm the band as the problem, roadtest in "L" (or "1" if its a six position selector) and you'll find you don't have any engine braking if the rear band or servo is faulty.
PS. The rear band adjuster can also come loose and cause the same problem.
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