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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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