I had a superchip on my 97 for about 50,000 before I came to PHP. All I can say is it has not died yet and now with the Phoenix it shifts so much better, and the extra power, not my main concern. Pulling my toy hauler, the trans is SOLID with the new tunes. Drive it like you stole it, you can break anything. Drive it like it is yours, I think longevity will not be an issue. Just my .02.
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'06 6.0 F350 CCLB KR.
stock... 
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