Does it get a growling sensation at lower speeds, and the tach drop down and back up a few hundred rpm? If that is what is happening, the torque converter is failing, and the metal from that damages the rest of the transmission. The fuel economy strategy of the 14 and up trucks is very hard on the torque converter clutch on the 6L80E. The heavy use of that already small clutch distorts the torque converter cover, which leads to hot spots on the clutch, which leads to delamination of the clutch plate, which then begins steel on steel contact. If it ends up being rebuilt, make sure the rebuild uses a billet steel converter cover. The originals are stamped steel, billet provides the support to keep the converter alive. There is also a fluid thermostat upgrade to drop the fluid temp a tick. 150K is a lot of miles to get out of a 14 up 6L80E, I'm usually replacing them at 100-130. You've done well with it.
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Today's Featured Article - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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