Fostang, that's the way my C-4 started acting right before I had it rebuilt. Then the soft 2-3 shift became major slipping at WOT with the engine reving up between 2 and 3. Turned out the 3 rd gear clutches were fried. I had a guy rebuild mine fo $200 with me doing removal and installation. My guess is your 3 rd gear clutches are going.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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