New to the form, Have a 2017 GMC Yukon Denali, bought last summer knowing id probably have to perform the DOD delete. Well not in even a month into owning it on a roadtrip with my family to North Dakota #4 lifter collapsed and broke the push rod in half. Took about a month to source all the correct parts and what not. Ended up with BTR stage 2 truck cam, LS7 lifters, TSP oil block off and a mail order tune. Got it running and back on the road. Fast forward a couple months the wife started noticing a shudder during lite acceleration and going up a hill. Was reading thats pretty common on the 8L90s. Did 2 transmission services. Seemed to get a little better but it was still there. Needless to say dropped the vehicle off at the dealer cause i have an ext warr. Vehicle sat at dealer from 12/19-3/25. Got two transmissions. When i drove it home it seemed fine. However was driving it later that night with my wife and noticed the same shudder if not worse. Then started reading about tuning the transmission. Purchased the HP tuner T87a unlocked TCM. Installed and attempted to match RussK tune file. Not sure if i did it correctly. Id say the shudder is 95% gone but every once and awhile you still feel something. Any help would be much appreciated ! Thanks in advance !
marshall NEW NEW .hpt
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Originally Posted by Russ K
