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Why can't I check the box 'shift gears' in a full vehicle analysis: acceleration with sedan_FWD?

nele.harnack
My settings for the full vehicle analysis (acceleration):
end time: 25
number of steps: 5000
simulation mode: interactive
road data file :mdids://acar_shared/roads.tbl/2d_flat.rdf
steering input: straight line
initial velocity: 5 km/hr
start time: 2
open-loop throttle
final throttle: 70
duration of step: 5
gear position: 1
quasi-static straight-line setup [checked]
create analysis log file [checked]
 
I use the 2016 version of Adams Car and the provided sedan_FWD.asy without changes.
I can't check the box 'shift gears' in the settings of the acceleration simulation and if I plot the gear over time afterwards it stays constant (1 in this case).
However if I plot e.g. the longitudinal velocity of the chassis over time, the graph shows plateaus as if there was no acceleration for a few time steps. Also the engine_rpm gets smaller during those timesteps.
Can anyone explain to me what is happening there?
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