Leo Opalewski

Has anyone experienced any good tuners in Central texas? I'm from Killeen/Fort Hood area. Anyone tried Mike from Sunshine in killeen or had experience? Or can anyone recommend and great tuner in the area for GM/LS platform? Thank you.

I'm pushing 170k on somewhat stock 5.3l lmg0 CC gmc sierra 1500. Its the garbage 3.08 gear and g80 locker. Going to regear to 3.73 with truetrac. On 24" 285 40r24. Lowered 2/3 going 3/5. Not important. My question is should I stick with the 5.3l do a afm delete a good choice of torque cam or vvt tsp cam redoing heads, chain oil pump tune etc. Cost would be around 2500 plus labor so around 4-5k on a mildly tired motor. Or do I purchase a brand new l96 6.0l for 5-6k and throw it in maybe throw a mild or tsp vvt cam before its put in. Or do I buy a remanufactured 6.2l l9H do the same for cam as well or not for around the same price of the l96? Problem with the 6.2l is a 2500$ core charge. I do not think my 5.3l would be an acceptable core I would probably have to sell it through the market. Reasons for the l96 is because it's a very reliable motor and it's flex fuel and has VVT and no afm. The l9h 6.2l is the same as well. Its a daily driver vehicle seldom will do WOT pulls. Only do it to pass poeple on highway or to hear the nice engine roar and feel all warm and fuzzy inside. Might pull a fishing boat if the season is right its a 17-18' aluminum hull bass tracker. Didnt really pay attention to the weight. I just feel the truck is a dog just driving around town. Also am worried about the reliability of the 5.3l with high mileage. I know the 6.0l lasts well over 250k miles not sure on the 6.2l. I run Amsoil SS and have universal bypass as well and change oil twice a year. Thays probably not important either. Buying a used engine not knowing what the person did to the engine before me kind of throws my peace of mind out the window. Your suggestions would be appreciated. Thank you.

Yeah when I installed them they were moving fine. Even used a runout gauge to text axial play. Transmission is 6l80

Also motor mounts were replaced last year and transmission mount is fine. No cracking etc. Have to really push on it to move it.

Same driveshaft. I replaced the u joints. But that was way before this started happening. Maybe I used the wrong u joint clip size and they shifted a little. Just hoping its not my trans. Looking for some answers.

My pinion angle i believe is fine. Truck is lowered..... Trans -6 shaft -3 diff +5 it started happening about a couple months ago. U joints were replaced. I think its 4th gear when I step on the gas pedal if feels as though I running over a rumble strip between 58-63 mph. The more rpms I am at at this mph range the vibration is stronger. Stops after the speed. No vibrations from 65 and above. Did a few WOT runs, no traffic on highway. No abnormal vibrations at 0-55 65-97. Only happens upon acceleration. 3.08 gear ratio. 2010 gmc sierra CC.