Did you get your problem fixed?
The reason I ask, is that my problem was just a loose belt. It was acting strange like yours, but I never heard the belt squeal at all. The old belt was stretched, and couldn't be tightened anymore. A new belt solved my problem. I guess it was slipping most of the time, even though it never squealed.
You might just need to tighten your belt.
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Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's
Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's
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