Trans shiftkit?

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I have a 05 hoe with 5.3 and plan on doing some towing which shift kit should I be looking at ? I have already installed a second trans cooler and the corvette servo. I will do the install myself can I use a boost valve on this year ?

 

[ccapehartusarmyINF.(ret)]

id stay away from yer cheap shift kits there a waste of money if yer capable
i just go ahead and get a performance rebuild kit for towing i think ive seen em for like 2 -300 bucks thats what i did on my tahoe when i rebuilt it that with a vette servo and it would chirp the tires going into second if i put my foot into it

 

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how do I tell if I can change the boost valve for this year (2005) with out dropping the pan?