Today... I made it work with my Kenwood TMV71a which is also too long to fit nicely on the bracket. the thing that is actually in the way a hidden shroud that blocks off another inch or some of space before getting into the trim that you actually see from the cabin. If you go in there and cut that, our longer radios then will fit without interfering with the glove box.I tried with all my might. Blood and sweat involved. 5 hours later. No radio in car.
The difference ended up being 2 inches in depth and half an inch in depth greater between your Yaesu FTM-400XD and my ICOM ID-5100a. Got close a few times, but the clearance of the radio needs to be completely above those bars for the glove box to close.
Tried mounting on top of the glove box as well, but that pushed the radio against the AC blower and prevented glove box closing as well.
The easiest part was wiring up the my desired aux switch. Took all of 15 minutes.
Next option is to just store it in the glove box and drill holes...
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