newmercman:
The Paccar on the other hand is more frantic and requires either a very fast shift, or to be fed in on a rising throttle, the latter being the easier of the two to avoid playing tunes, but the former gives a cleaner shift, as long as you are quick enough.
The Rolls/Fuller or Foden combination in the S83 was similar and like the Detroit suits my preference.Although the Rolls seemed to me to provide just the right balance between not too frantic but not too slow.Good Sisu examples here.