Allison 5sp: Bad converter ?

Sep 17, 2008
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Racine,WI
As of late my trans has been acting up,Im getting a shutter all the way to lock up. When it does lock it shutters and pulses into lock up then the pluse or shutter goes away. At first i thought it was a lift pump or rail pressure issue as the shutter or flutter feels like lack of fuel . No codes in trans or ecm ,lift pump working fine ,new fuel filter ,newer spin on for trans but it is over due for service since its been built (2k) . Also trans temps have been super high(250+)
witch has never happend before .

Thx Ben