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HI, I've got the same problem with my '72 142s B-20.
I hope to find the answer, if you find out let me know.
I actually have been meaning to do a tune up, timing soon, I've been putting it off 'cause the car starts right up and runs good up untill 4000. I know my rear end is making a lot of noise as is my M40, (no overdrive yet).
I hope to rebuild the rear end, drive shaft, and axle bearings/seals soon then it is on to an engine rebuild and OD maybe over the winter or next year. I want 6,000rpms and smooth running.
CU
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