Reversing the gate depends on how you mount the gar selector...
1st option is to turn the selector arround, so the long rod comes out the back, if this is the case remove teh scresw from the plate on the bottom , and turn it round 180 degresss and put ti back on, job done.
Newer chassis will take the gear selector to fit the same way as it was in the mini, in this case you need to take the plate of the bottom, and knock out the two split ins holding the long rod and short rod in place, and swap these over, then put the plate back on in its original position.
Simon