That transgo will really help make your tranny last longer. But make sure you get the Transgo HD model. The Nelson Tune will also help by firming up those shifts. And you are right, there is not exact guarantee on trannies. All you can do is hope, because honestly you are at just as much risk of blowing that tranny with or without a nelson tune/transgo combo. Some last, Some don't.
Big and little of it is, that combo will help more than hurt. And concerning the TQ managment, take it all out and you will enjoy the shift kit more. While Allen can't guarantee that your tranny won't blow, he can definately make your riding experience more enjoyable.
Just a note: You can buy that Transgo HD and a Corvette Servo combo from Allen for like $130, just something to consider when you buy your tune from him. Make sure you talk to him on the phone about it.
FOR ALL YOUR WHEEL, TIRE, AND ACCESSORY NEEDS
CONTACT: EPLEY'S TOUCH OF CLASSIC 1-270-843-6892
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2000 Chevy Silverado 4.8L RCSB: smoked UPD, Flowmaster exhaust, De-screened MAF, Nelson 93 hot tune. Upcoming installs: trans-go shift kit, Eaton posi, billet servo, ported and polished throttle body...Near future: 6.0/4L80E install with 150 wet shot