I would thing that since this is a built up trans by DTT that would not be needed since the valve body and torque convert all have been upgrades.
Unfortunately, that does not hold true. Even the best built trans mission is going to have problems using an EB without some additional tweaks.
The transmission on your truck is designed to adjust TV pressure in relationship to throttle position. For all intents an purposes, TV pressure relates directly to apply pressures in the clutch packs and TC. The more throttle is used the higher the pressures, the less throttle the less the pressure. What is the first thing you do when you activate the EB? Step off the throttle of course. This immediately drops apply pressures across all the clutch packs and TC clutch. It also recuces the amount of fluid flow that can run thru the cooling system.
At closed throttle minimu TV pressure the apply pressures are genrally in the 75 psi range. Not bad and much better than stock. At full throttle and full TV with rpms over 1600 you should see 140-160 psi in the apply circuits and full flow thu the cooler. There is a huge difference in the holding power and operation from 75 psi to 150 psi.
The PressureLoc address this by attaching to the TV lever on the transmission as an over ride system. Wired in correctly, when you step off the throttle and the EB activates the pressure loc maxes apply pressures to prevent slippage and heat. whe the EB goes off by stepping on the throttle or manually shutting it off the TV goe sback to normal operation controlled by throttle position. At the price of thes transmission, you CANNOT afford not to help it any way possible.