I had the same issue and it turned out being the VB i guess the aluminum will wear out and let pressure go by the spool valve. It isnt noticed on a stock VB but when the pressure is turned up it will. Does it shift normal into O/D or Lockup?
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03 3500 QC SB 4x4 Auto, 2.5 puller
07 Mega Cab dually4x4,Auto, 5.9 ,
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