Torque Converter noise sounds almost like a Blow Off Valve

Shipmate

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On any tune when the torque converter locks it has a hissing almost like a Blow Off Valve whooshing sound. This is right at 45mph under light to mid throttle. At WOT I do not hear it at all. Slippage in not to bad maybe 18 to 20 then setting down to 10 or less.
The truck is a 08 with 48K and egr delete, 4" exhaust, Spartan CFM and upper IC pipe and 35" tires.
I need to know what this is because the truck get put on a ship in a month and will be shipped to GUAM to where I am moving to.
Thanks
Luke
 

Corb@CorbinShipping

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On any tune when the torque converter locks it has a hissing almost like a Blow Off Valve whooshing sound. This is right at 45mph under light to mid throttle. At WOT I do not hear it at all. Slippage in not to bad maybe 18 to 20 then setting down to 10 or less.
The truck is a 08 with 48K and egr delete, 4" exhaust, Spartan CFM and upper IC pipe and 35" tires.
I need to know what this is because the truck get put on a ship in a month and will be shipped to GUAM to where I am moving to.
Thanks
Luke

Guam!?!? WTH?
 

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