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Flexible body Shift

Hello,
 
I'm creating a flexible suspension subsystem from a rigid subsystem. It involves replacing the control arms and the subframe with MNF files which has been carried out successfully. Next step is to adjust the subsystem to tune the wheelbase. But I find that the subframe part remains as it is whereas the other parts of the suspension moves. I tried the same in the suspension template as well, it doesn't move. Any ideas and suggestions are welcome. Please find the attached photos.
 
Regards
Shankar 
Subframe_Shift