i wont hurt your tranny, if anything itll help it.
its to firm up your 1-2 shift an if you get the 4th gear servo that'll firm your 3-4 up. the servos really benefit you when you upgrade your converter to a looser one. the converter absorbs the force of the shift basically. so servos help with a soft shift when a stall is added. when you add a stall it causes your shifts to feel very soft. my 3-4 is soft, you can barely tell its in OD bc of my stall.
2008 GMC CCSB 6.2/6L80e swap
Gen IV 5.3/60e swap 1994 ecsb W/T