Join Date: Aug 2006
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Is your transmission stock other than the Bully Dog shift kit?
Given stock TCM programming, the 5-speed Allison's stock convertor and C2 clutch will only support up to 700 ft lbs. rear wheel torque. Power levels up to approximately 900 ft lbs. rear wheel torque will require at a minimum replacement of the converter and C2 clutch modifications.
Consider at a minimum installation of a triple disk convertor and complete Transgo kit. Minimum cost will be $3,000.00 +.
If I understand correctly, the Bully Dog shift kit has an issue. The increased main line pressure it's trim valves provide is affected by the Allison's adaptive learning feature. If you do nothing else, you may wish to consider replacing the Bully Dog shift kit with the Transgo shift kit's valve body modifications.
2004.5 2500HD CCSB, 4x4, D/A, tow tune, TD-EOC
Goodies occupying space in garage: Corsa full exhaust, Isspro gauges, KB CAI
2006 Tahoe Transport 33WTB; 14,000 lbs.