Dedenbear Case

ray sowers · 04-10-2014, 06:27 PM

[QUOTE=Roberts Motorsports;424171]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[/QUOTE

I drill a .032 Dia. hole in the reverse piston just under the piston seal and the Dedenbear case air bleed hole is way too low that still leaves some air in it.
I am not in the commercial transmision business and have been helping people with
Powerglides built by other people since 1985 including ones we race in our car.

04-10-2014, 06:27 PM	#6
ray sowers Junior Member Join Date: Feb 2008 Posts: 32 Likes: 0 Liked 0 Times in 0 Posts	Re: Dedenbear Case [QUOTE=Roberts Motorsports;424171]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[/QUOTE I drill a .032 Dia. hole in the reverse piston just under the piston seal and the Dedenbear case air bleed hole is way too low that still leaves some air in it. I am not in the commercial transmision business and have been helping people with Powerglides built by other people since 1985 including ones we race in our car.