Hi LTSI,

Transmission pressures are normally around a160psi, you should be able to go into calibrations via the Display Switch Cluster and change the transmission pressure, this may be all that is necessary to sort the problem.
Remember to delete the fault codes logged in the error log as they may contribute to stopping the truck once they have been logged.
Check your radiator and oil cooler for be clogged up with dust and debri sometimes I think a heat problem may cause this problem.

Nero