Re: Dedenbear Case
The reverse passageway in the Dedenbear case is big enough as is. Of course you want to make sure that the adjuster is set so that it is not obstructing the passageway. The adjuster is the way that you can adjust the "hit" of the T-brake releasing. I've experimented with extra holes in the past and never found any benefit.
Of course, you want a quality trans-brake. TCI's T-Brake is not what I consider one of the better ones. I'm partial to the Transmission Specialties T-Brake
The small holes that you have in the reverse piston are air bleed holes. Allows any air in the reverse cavity out so it fills more efficiently on T-Brake apply.
The Dedenbear case has an air bleed hole in the case, so the ones in the piston are not needed. You can seal them with epoxy. Remember, once the air has bled out of reverse cavity, the holes become a very small fluid leak. Normally one .032" to .050" hole is sufficient
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