hey guys I am a newby to this site,and I think its the best one Ive seen so far.....anyway I have a 2000 gmc 5.3 EXTSS and had the trans built this week and of course it shifts so hard the tourque management is killing me,but that can be cured my problem is about 3 weeks ago when it shifts under hard acceleration you can hear a popping sound coming from my exhaust.I know for a fact its not hitting the rev limiter because its shifting at 5500 from first and 5500 from second I removed my HPP 3 to no avail.I tried new plugs, new TP sensor.No luck. Any help would be greatly appreciated,And can someone help me get in touch with farmtruc....I hear he is the MAN Im in Fort Worth and need some tuning done