Need help with noise from Gear Box change on ford forte

I have a 2001 ford falcon forte Automatic which i took for a service last week. Two of the rear break pads needed changing and a suspension retorque
was done as well as a transmission service where a auto transkit was put in.
Now, whenever i change gears from say Parking to Drive or Reverse to Drive, i get a noise for a few seconds. However when i press the break really hard or harder than i normally would, the noise would be very minimal.
Can anyone help me out with this problem? Is this a break issue? Is it normal? Is It a deeper problem?
Thanks guys!
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