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Another simple thing to check is the base gasket where the turbo sits on the exhaust manifold. The two inboard nuts were loose on my truck (probably because they are a bit of a bear to get at). My gasket was in good shape so I tightened it back up and found it made quite a difference. A new...

#2: The problem with the tcase and reverse is not about the mounting of the tcase. It is about the wicked low reverse gear in the Allison. Coupled with the tcase in low gear, the torque exceeds the strength of the case. I imagine that if you make enough engine torque with performance upgrades...